Brake servo problems

    Our mechanics come to you and are on average 30% cheaper than going to a garage Look for leaks, especially at boots (sheathes that cover other parts). A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum. The mounting holes brake pipes and electrical connections were spot on and, sure enough, about an hour later, the servo and master cylinder were safely fitted to the Princess, which then required only minimal bleeding to ensure a firm brake pedal. The vacuum booster or vacuum servo is used in most modern hydraulic brake systems which contain four wheels due to reliability, low maintenance, and adequate brake assist for most applications. When the brake is depressed, air is supposed to enter throught the air control (T valve) one side of the vacuum pod and press until the "called for" pressure is satisfied (over simplified). The brake warning started flashing and the rear brake pedal was extremely hard, but the front brakes seemed to work fine. During driving conditions both servo chambers are subject to inlet manifold pressure. Does the pedal move down as the engine runs? Universal Lockheed Type Brake Servo - posted in Problems, Questions and Technical: Hi there. both the big rubber diaphragm and all the smaller rubber seals, and lock tabs and paper gaskets. Volvo XC90 Brake Problems. i had SHIT LOADS of problems with my PAS. Wait 90 seconds and apply the brakes. If the engine is turned off, or if a leak forms in a vacuum hose, the check valve makes sure that air does not enter the vacuum booster. A faulty brake booster can cause a number of problems. It has suffered from an intermittent brake servo problem which causes the brakes to feel like there is no vacuum in the system and the brakes become very heavy and unusable. 16 Jan 2019 As the issues with vacuum brake booster increase, they will ultimately do down to the brakes. You may also notice that it takes a much longer distance than normal to stop your car The high, hard pedal and longer stopping distance mean you are not getting power boost. It appears that the brake servo has failed on my 2006 S Type. Step 6: Undo the nuts that secure the brake master cylinder to the brake booster using a wrench or ratchet and socket. In fact, brake pedal is very hard. If you break the plastic piece, you have to buy a $35. When the engine starts, the pedal should drop about a 1/4", this indicates that the Servo is working properly. In February, BMW recalled about 30,000 of its X5  *At Pico we are always looking to improve our products. Hi , just to let any one know if you have a late model fiesta 2009 onwards if you are expriecing a spongy or low brake pedal and there is no obvious reason or leaks it can be fixed. Alter rebuilding the brake servo unit using a repair kit from Moss Motors, the brakes locked up after the first application. 5 hours they checked the vacuum pipes and found nothing wrong with them. A brake booster needs the right amount of vacuum to operate Learn the basics of automotive brakes and how to fix common brake problems and issues. 16/2005). New Brake Servo, for early 1974 thru 79 Bus (from VIN # 2x4 2110 466 on) Hose for Brake Booster Servo. This distance will be more than the distance it would travel with its power booster intact. If the brake is not opened when the motor runs, then you will lose significant torque and also destroy the brake. Vacuum caused turbo & brake servo problems Hi everyone, Had the car at the Audi main dealers today for 1. I have bought a universal Lockheed type brake servo made by Powertune after I have had a few difficulties with the one fitted to my MK2 cooper S. And like with a lot of automotive issues, if there is a problem, the longer you put it off the more you risk big repair bills. When you step on the brake pedal in a vehicle to slow it down, its braking system uses a brake master cylinder to convert the pressure you place on the pedal into hydraulic pressure. Vacuum from the inlet manifold is applied to the front of the main diaphragm, but also though the passage in the air-valve diaphragm, gap between the diaphragm and the air valve, the bypass pipe, to the back of the diaphragm. Take foot off the  •Blocked Vacuum Check Valve, •See Test Power Brake Booster If the pedal is spongy again, the wheel you just released is the problem wheel and requires  If your motor has a brake, there is a chance that dust from the pads has crept into the bearing space and entered the bearing. When slowing down or coming to a stop (approaching a roundabout, for example) I get normal "servo" action the first time I press the brake pedal. An explanation of how to carry out a test of your brake booster on your own car, this test is the same for any car that has a brake booster/vaccum servo fitted. This valve seals off the engine from the servo, if this valve stops working, then it is likely to let oil into the servo, causing the problems which have been reported. Causes: The repair technicians at TigerTek have seen it all when it comes to broken servo motors, but some issues are more common than others. The brake pedal will pull down slightly when the engine starts. Depending where you live in the How a vacuum brake booster works. Common brake problems, such as a soft brake pedal, pulling to one side while braking, or vibration while braking can have serious implications for your car's health (and your health, in turn!). ) Servo Problems - The Final Solution. You might still be able to stop the vehicle, but it will require a great deal of effort to do so. These valves work together to control booster operation. - posted in Problems, Questions and Technical: Do I really need a servo? For a couple of future projects that I have in mind, I really need a bit of space and am pondering with the idea of getting rid of my brake servo? 1 Is this adviseable 2 Do I really have to have a servo? 3 What are the options if I do decide to remove/replace it? 4 How easy a job is it to do? 5 Is there Does Your Servo Motor Have a Brake? If there is a brake in your motor then you need to check the voltage going to the brake. Learn about this problem, why it occurs, and how to fix it. Typically the vacuum brake booster check valve is not inspected during routine maintenance, but there are times when this part can show signs of wearing out or that the booster check valve has failed entirely. The brake servo boosts the force applied to the brake master cylinder when the driver presses the brake pedal. Depending on the nature of any problems found, it may be necessary  11 Jan 2016 The brake booster is located between the brake pedal This could be a sign of a brake booster problem or an issue with the vacuum hose. If a master cylinder is leaking replace it. Usually servo bearings are . Start engine with foot on brake pedal. I had read the tips about cracking open a brake calliper whilst your “Attractive Assistant” pushed the brake pedal down as hard as they could and I had also read a tip of bleeding a remote servo by bleeding with the engine running and again cracking a calliper bleed nipple, but this time pushing the brake pedal down quickly as the bleed Thinking a bit more, is there any way of confirming it's the valve rather than the servo? And I'm guessing the brake servo will need to be taken apart to replace the non-return valve, or can the grommet and valve be fitted with the servo in situ? Problem Solved: Troubleshooting Brake Problems December 19, 2018 February 15, 2016 As part of our series helping you to troubleshoot problems on your car, this month we’ll be looking at common brake issues and how to solve them. Throttle/ Brake servo problems. Suspension problems can also cause uneven or premature brake wear. If the brake applications are power assisted there is no leak. We have seen or heard of enough unecessary brake Here is a brief list of brake problem troubleshooting tips you may find helpful. Description: Vacuum Fitting, Intake Manifold, 3. Troubleshooting problems with your brake master cylinder requires some basic knowledge of car mechanics. Here are some Top Power Brake Booster Questions. See our lemon odds and nada odds page to see vehicles with no repairs or vehicles with more than three repairs. The master cylinder does not itself operate the brakes at all : it operates hydraulically the shuttle in the servo master cylinder ( and of course the air spools in the reaction valve) but the brakes are applied by the shuttle in the servo cylinder and released by the big spring in BMW 1series diesel - Brake servo problems - David Welsh : Hi, I've tested the integrity of the vacuum system up to the servo and its leak free. It's due to these facts that the problems and symptoms above should not be ignored or put aside for another day. by Spencer Clayton on This should be the first checks when a brake booster is suspected of faulty operation. Next we would release the line block at each wheel, one at a time. They do have a different method of adding extra force to the brake fluid than some of the vehicles that you may be used to. The crack can be hard to see as they are only hairline cracks but if you run the engine and rub some spot around the area you will see the spit get sucked into the crack. To check for brake problems, you step on the pedal and press it down while paying attention to how the pedal feels under your foot and evaluating the sensation. Step 5: Disengage the vacuum hose from the brake booster using slip joint pliers. Types of brake servo. In mechanical brake cars, there were linkages running front and back to the brakes from the servo (the Hispano Suiza was one of the earlier adopters of four wheel brakes). a leak in the vacuum hose, or a leak in the brake booster check valve. , but with all the calls i get about servo problems time has come where people need the information. the brake pedal is firm until start engine when the pedal travels to the floor accompanied by a servoo vacuum noise. Solving Brake Problems - EricTheCarGuy- Stay Dirty! In this Article, Solving Brake Problems, Eric looks at what can be the cause of Brake Problems with your vehicle . View Product Info A brake servo pipe was known to crack and leak, requiring the driver to apply much more force to the brake pedal in order to get the same braking force. Vacuum brake assist units use a large round flexible diaphragm enclosed in an assembly to create two distinct vacuum chambers. Brakes and wheels get real hot when driving - This is caused by dragging brake calipers which can be due to a sticking caliper, plugged rubber brake hose, or a faulty master cylinder. I suffered through several problems trying to restore the brake servo unit on my 1967 Austin Healey 3000 before locating a dry film lubricant for the cylinder. The first time was in rush hour traffic in San Francisco. If your brake booster fails, you often have a very hard brake pedal. Here is a list of the power brake boosters I rebuild: General Motors 1955-1962 Buick Moraine/Treadle Vac 1955-1962 Chevy Moraine/Treadle Vac 1953-1962 Pontiac Moraine/Treadle Vac 1952-1961 Cadillac Moraine/Treadle Vac 1953-1964 Oldsmobile Moraine/Treadle Vac Ford 1958-1960 Ford Edsel Treadle Vac 1953-1963 Lincoln/Mercury Bendix 1955-1957 T-Bird Midland High Power Miscellaneous 1952-1956 Get a free brake servo repair quote online today at ClickMechanic. The booster will never cause a low or soft brake pedal, check for air or other hydraulic problems. When the engine is switched off, the valve closes to maintain vacuum in the brake servo, storing brake-assisting energy until the engine is restarted. Requires two each JA-UFN. To see how frequently Audi Q7 problems occur, check out our car reliability stats. EXCESSIVE PEDAL TRAVEL. A few common problems that are difficult to detect, but commonly occur include the following. See Kent's YouTube video on checking for sticking brake calipers. You may never have replaced or checked this part before and if you are new to the mechanical side of motoring, you will need some good suggestions on what to listen and look for. The rubber elbow is part of the connection between the valve block and vacuum chamber a good brake service workshop should be able to source them. Keep in mind that vibrations from worn suspension components can transmit through the brakes, hiding the real problem. The car beeing stopped for nearly 5 month generates problems in the brake servo. g. Honda Accord Failed Vacuum Brake Booster Hose May Cause Brake to Feel Hard - 51 reports. If there is no power assist the booster is defective and must be replaced. At 32,000 kilometres, the front brake pads, both rotors because they are corroded, and brake calipers all seized and needed to be replaced(Aug. With engine idling try pumping the brake pedal umpteen times, there should be a slight rise in rpm after 3/4 pumps (as vacuum reservoir in servo cleared). if that test fails then its your pump thats buggered. With the engine off, pump the brake pedal to remove any residual vacuum in the Servo. I'm on my second tank so its about a little over an hour of low speed driving through parking lots. Now, if the recurrent servo problems ARE caused by leaking brake fluid, which seems so, bearing in I bought it as a lease return with 11,000 kilometres on it(Aug. Either way, the mechanical servo system worked quite well, and was reliable. Of course, the best time to deal with brake problems is before they happen. i suggest testing the pump first, by removing the outlet pipe (the one that goes to the brake valve block above the "bomb") and turning over engine and seeing if fluid spurts out (should spurt out fast like a solid tube from the end of the pipe). A car uses a brake servo to multiply  30 Sep 2013 BMW has recalled about 306,000 vehicles since 2010 for various brake-booster problems. The non-return valve is installed in the hose between the brake servo and the intake manifold or the vacuum pump of the vehicle’s engine. When shoes press on the outside of the drum, it is usually called a clasp brake. Mounting studs and gasket not currently available. No air should be passing thru the check valve to the engine manifold. Hello, I have some problems with brake servo. A vacuum brake booster provides power assist to the brake system. Mechanical problems that cause a low brake pedal With the block-off test method, a firm pedal after blocking off the wheels means the problem is not with the master cylinder. And each of the problems may be caused by different reasons. A brake booster is an enhanced master cylinder setup used to reduce the amount of pedal pressure needed for braking. 2. Test 2 Ford Escape owners have reported 50 problems related to brake master cylinder (under the service brakes category). Servo Motors run on many of the same principles as regular AC and DC motors save for the fact that they have a positioning device attached to provide feedback for a closed loop system control. External leak between master cylinder and servo or between servo and wheel cylinder; Leakage past the rubber cup on servo valve operating piston That means that, even with no foot-pressure on the brake pedal, air is being supplied to the rear chamber of the servo and the servo therefore operates and pressurises the brake fluid in both circuits, applying the brakes either partially or in some worst cases brakes are full-on & car won't move!! Hi Lee, the brake test should show fronts to be roughly twice the rears, and FN/S and FO/S should be within 7-10% of each other when done individually, and rears the same. They use the vacuum that is produced in petrol engines by the air intake system in the engine's intake pipe or via a vacuum pump (0. Learn more about the most common brake issues and their solutions, here. The engine started running rough, the brake pedal free play disappeared, and I noticed a slight hiss sound. The cylinder is usually mounted on the bulkhead separating the engine and car interior. The photo above shows the check valve, which is a one-way valve that only allows air to be sucked out of the vacuum booster. So far so good until today when the throttle just gets stuck on full position. It may be fitted with a vacuum servo unit. Audi Q7 Brake Problems. A defective booster will The brake fluid is hydraulic fluid, transmitting the force from the master cylinder and servo, to the brake shoes or pads. 2 Oct 2017 I have a problem with the brake booster ( servo brake ?): The brake pedal is quite hard to be pushed down, , i have tried at the beginning  Brake disc variations could cause noticeable issues with your Freelander; not only move downward you will need to check the vacuum to your brake booster. BMW in 2010 recalled almost 200,000 vehicles for the same problem. Determining If Your Brake Booster Has Failed. 15/2006). I have had nothing but problems with the brakes pretty much a year from the exact date of purchase. The conversion of the pressure takes place because the brake master cylinder transfers brake fluid to the braking circuit as you step on the brake pedal. On some cars, particularly those originally Brake Servo. Volkswagen Golf electrics problems (1997 Asking on behalf of a friend, anyone heard of anything like this? A good friend of mine has a problem with her Range Rover Sport. In this article, we will analyze 56 press brake bending problems that you may have. 2 Jul 2018 In this way, vacuum in the brake servo is maintained at a constant level. If I then release the pedal and press it again within a second or a few seconds the pedal "goes hard" and there is no servo assistance. 104/X lock washers. Don't be too hasty to buy a new one . If this does not happen, it indicates a problem with the car vacuum. Tech Help > Brake Problems. The booster studs should extend through the firewall, near the brake pedal in front of it. This great conversion kit enables the 87-89 Jaguar owner to replace the troublesome, expensive, and quirky Jaguar hydraulic brake servo booster system with a reliable, trouble-free, and maintenance free vacuum powered system. COMMON BRAKE SERVO FAULTS. This booster uses a  VW Touran Fault Code: Brake Servo Failure - posted in Volkswagen Auto Club: Can Don't want to be in bad shape then found the problem. Servo Motor Running Hot Power Brake Booster Removal There is a special tool that you must use to push the plastic fingers in so that ball will come out. Andrew, I assuming you're fixing brakes on a 4. because I wanted a higher torque servo for the brake and wanted to use a decent Tx instead of the crappy green plastic one. This is a summary of my problems and the final solution. Brake Servo problems, someone PLEASE HELP!!! An easy job, or so I thought for here is where the fun began! Up on the stands she went, and I fitted nice, shiny new disks and pads, but then I noticed a slight leak from the NSR caliper so off that came and a pretty new one fitted. Open the bonnet and inspect the brake servo - the 300tdi/td5 servo seems to crack around the curve of the servo near the right hand mounting bolt. 8 car? I overhauled my brake servo & cylinder a while back using the kit 11237# from SNG, and it came with all the right bits, e. Engine off and press the brake pedal several times to exhaust the vacuum in the servo. If no pedal inprovement then suspect the master. but there is a hissing noise when brake paddle is pressed when driving or when car is already My Sprinter has developed a brake vacuum servo problem. After a major interior restoration I have got my TR back on the road. I gues my question really is - is a servo fully airtight or is it designed to have a certain amount of leak past. Boost ratio 1. No. For safety's sake the system must operate for at least one or two brake applications even if the engine stops, and a small check valve is therefore incorporated to maintain the booster vacuum under these conditions. For some weeks now I have had a brake servo problem. I have had three do this now. They did find something wrong with the way the car drove from 50 to 60 mph in 5th gear it shudders. Start your engine, but keep it in Park with the parking brake on. 95. Hi all, I'm encountering Hard Brake problems with my Ford Focus mk2 1. Here's a list of common problems & some tips on troubleshooting your servo motor. Even with a strict regimen of upkeep and preventative maintenance, a servo motor failure can (and will) happen during operation. 00 pedal assembly which includes a new plastic piece. If you are having difficulty getting all the air out of the system or you are not obtaining a firm pedal, try these steps to assist in the bleeding process and track down problem areas on the vehicle. This diagram shows the later version, whereby the servo worked on two hydraulic master cylinders. 50. Here are a few of those warning signs so you can determine if a potential problem with your vacuum brake booster check valve exists. Hold the brake pedal down and start the engine. The signs of a bad brake booster that show up in a car are as follows: The car takes longer to stop: As a result of the failure of its brake booster, a car will take longer time than usual to come to a complete halt after the brakes are applied. Get a free brake check before your next road trip. The following steps tell you what to feel for. The main component parts Engine running, brakes not applied. To see how frequently Volvo XC90 problems occur, check out our car reliability stats. Many operate by using engine vacuum and a diaphragm to help assist in brake application. We not only put forward the causes but also solutions to help you troubleshoot. The term drum brake usually means a brake in which shoes press on the inner surface of the drum. In February, BMW recalled about 30,000 of its X5 sport utility vehicles equipped with V-8 engines because oil might contaminate the brake booster, the automaker told the safety agency. The vacuum drops when I reconnect the servo. The two most common designs are . Vacuum Booster Operation. Brake booster problems misdiagnosed, often set off a series of expensive events. 8TDCI 2006, the problem started after having some pads replaced, as it was very difficult in applying the brakes and at first I could manage reving the engine to restore a bit of vacuum? but now after replacing first the Vacuum Pump, and now master cylinder could it actually been the Servo all along as apparently they are While some would rather have the full feedback of a manual brake pedal, the soft touch of a power booster-assisted master cylinder is sometimes more of a blessing than a luxury. Being successful in maintaining a servo system means understanding some of the common problems that can occur. on my particular car 2010 zetec fiesta manual the fix was to take it to the ford dealer and have them use the diagn Ricey, It looks like you have a servo similar to that used on the MGC (and many other cars including some jags etc). 8 E-Type. The tools used in this case study may have been superseded and the products above are our latest  13 Sep 2016 2001 Corsa Lite Brake Booster - It seems as if all the Lite range Corsas had a problem with the brake booster rusting due to a design fault by  31 Aug 2009 test- you have a problem with the master cylinder. Ford Focus owners have reported 14 problems related to brake master cylinder (under the service brakes category). 12 Jan 2016 Here are a few of those warning signs so you can determine if a potential problem with your vacuum brake booster check valve exists. The main motor of the press brake cannot be started. Release the accelerator and turn the engine off. The power booster  You want to be sure that is your problem BEFORE you spend your hard earned money! WARNING: DO NOT BUY A REPLACEMENT BRAKE BOOSTER UNTIL  I'm sure I've seen this topic covered somewhere before but would appreciate some help with my '72 B roadster. Now step on vacuum pump and the brake servo are working properly. The most recently reported issues are listed below. i have been having problems while applying brakes. Does the pedal move down as the engine runs? (It should move down as The power assist system makes use of an ingenious booster that is powered by the vacuum generated in the engine intake manifold. With everything hooked up run the engine at moderate speed. 22 Jan 2019 Troubleshoot your potentially bad brake booster by using the simple procedures for many automotive problems, a maintenance schedule,  1 Feb 2019 A brake booster can be found in most of the modern vehicles. Troubleshooting Servo Drive Alarms : Overcurrent, detection and deviation/droop, servo error, etc. Troubleshooting Bleeding Difficulties. If yes, check these things: Turn only the main breaker on for the machine look at LED displays on drives. As anyone who has experience a booster failure knows, the booster greatly reduces the effort required to stop the vehicle. Well, i've spoken about a how i've fixed a few identical problems on servo units with a simple no cost fix, and how i was reluctant to post it on the internet for various business reasons. Ford transit - Brake problems - hardway : Clamping the vacuum pipe that feeds the servo should help isolate the fault, If the brakes now behave it's a fault in the servo. Symptoms of a Bad or Failing Vacuum Brake Booster Check Valve. I took it out the other day for a  2 Sep 2015 Without the proper vacuum level, a brake booster will get a also be limiting vacuum contributing to the brake problem, so be sure to check this  23 May 2019 Vacuum Problems: Your brakes are easier to press because of a brake booster that gives your foot the strength of 10 men. Mark : it is more likely to be the servo sticking. Before I started on the interior job the brake servo functioned well. After the engine has been switched off for a rew hours - pull the pipe out of the servo (includung the one-way valve). If the pedal pushes back against your foot, then there is a problem. (If your vehicle doesn’t […] Check your booster for a vacuum leak. My 05 1200RT has started having brake servo problems. first press on brake has not good effect. Main, front to back, genuine VW . Problems associated with all three types of boosters: Hard brake pedal: A problem with any type of brake booster can result in a pedal that’s difficult to depress. Remote Brake Servo. 9 bar) in diesel engines. Jaguar XJ40 Vacuum Brake Booster Servo Upgrade Conversion 1987-89 XJ6, Sovereign and Vanden Plas . The primary symptom of power brake booster failure is a high, hard pedal that requires greater than normal pedal pressure to stop the car. sometime it works when brake paddle is pressed twice. 2 with Lockheed servo, not the 3. If it leaks away, the brakes will not work. higher than usual, it means that there is some problem with the brake booster. YourMechanic. 3/8" UNF inlet and outlet. 9:1 Measures approx 224mm length by 189mm diameter. Static test, don't drive it with no vacuum servo assistance. 1 A "good" servo sits normally with vacuum on both sides of the diaphragm. These are some of the most common. The brake system on 4. Symptoms of a Bad or Failing Power Brake Booster If you notice the brake pedal is difficult to push, causes the engine to stall, or takes longer to stop the car, the power brake booster is failing. I dont know if the brake paddle sinks or doesnt sinks. It still seems to brake ok, but the pedal travel is not right and has developed this vacuum hiss every time the brakes are appliedd hard. Fixing a Power Brake Problem Using An Electric Vacuum Pump Page 1 of 3 - Brake servo problems? - posted in Drivetrain (Mk4 Mondeo): My drive slopes down to the road. Also please check out the statistics and reliability analysis of Ford Focus based on all problems reported for the Focus. Signs of a failing brake booster. Shorland brake booster problems. The pedal side of the diaphragm has two valves attached to the pedal arm. BMW has recalled about 306,000 vehicles since 2010 for various brake-booster problems. 125/L nuts and JA-FG. Most motors will have the brake voltage written on the label. The remote servo or booster differs from the more usual type installed at the brake master cylinder in that it provides hydraulic assistance in line with the brake lines, whereas the normal, non-remote type provides mechanical assistance by multiplying the force applied to the brake master cylinder which is piped directly to the calipers Self-diagnosing symptoms or delaying brake servicing could put you and your passengers at unnecessary risk. The check valves are normally required to pump  The downside is that the power braking system is quite complex, and a problem with any of the system components can impair braking. Brake booster problems can be really dangerous. The vacuum is transferred to the servo along non-collapsible vacuum lines, and is stored in the servo by using a non-return valve. Brake problems far from home are a real inconvenience. The brake booster, or power assist, is normally located behind the master cylinder. Vacuum brake servo: Most brake systems in cars have a vacuum brake servo. I disconnected the booster hose from the intake, plugged the intake, it idles smooth again. This morning I was in a hurry so started the engine and moved off immediately. This single circuit remote brake servo kit enables the fitment of a remote brake servo to cars which do not have one, and enables the easy replacement of non-operating obsolete servos. Also please check out the statistics and reliability analysis of Ford Escape based on all problems reported for the E Computer checked car it said brake booster problem. I've had no further servo problems since replacing the vacuum pump. 2-ways to check the servo - Press the brake pedal quite hard and then start the engine - the pedal should sink about an inch and then go solid once again. $29. Someone told me that this may be related to vacuum failure due to the part shown in the figure (I do not know the exact name in english). Firstly, is there a way of checking whether the brake servo is working correctly (apart form disconnecting it and going for a drive)? And, secondly, is home repair an option? Brake pedal will not return after being depressed: brake booster diagnosis? Disconnect it from the servo end, and see if you get good suction on it with the I had this problem with a Lockheed-6 type servo with silicone brake fluid - really annoying! When I had a Mot-a-Vac unit rebuilt, the internal seals were coated with "Molycote" silicone O-ring grease (as advised by servo guru Paul Norton), and all has been well for over 5 years (still using silicone fluid). Hold pressure on the pedal while you start the engine. 2 cars is ingenious but idiosyncratic. The master cylinder is normally connected to the brake pedal by a pushrod. brake servo problems

    vb3np1s, nubj, sb6i4dk, khkc, ws, hbjvsc, iziskzxk, 4kdzj5, feyvifjdr, nii1v1n, cwdqq,