Brake Fluid and Lubrication

Symptoms of bad master cylinder 96 vw jetta?


Top Answer
User Avatar
Wiki User
2015-01-14 21:28:29
2015-01-14 21:28:29

Although they can fail abruptly the most common symptom you normal see is that when you stop and hold pressure on the brake pedal it will very slowly go down toward the floor. It will not hold steady pressure because the seals are bad. It must be replaced immediately.

User Avatar

Related Questions

the pedal will slowly depress with no loss of fluid

A symptom you almost always feel is a brake pedal that will not hold. You stop, hold the brake, and the pedal will slowly move toward the floor. This is a sure sign the master cylinder is bad. A leaking master cylinder or one that sticks, is also a sign is is defective. When you replace the master cylinder replace all the brake fluid in the brake system and bleed the brakes. Moisture in the brake fluid will destroy a master cylinder and this may be why it failed.Brake fluid leaking from the master cylinder. When you stop and hold your foot on the break the brake pedal will slowly go to the floor. Either of these symptoms means your master cylinder must be replaced.

how do i know the master cylinder is bad ?

A "Bad cylinder" or "dead cylinder" is a cylinder with Low compression psi. Symptoms: rough running low power can cause high oil consumption

Soft clutch pedal that goes to the floor. Repeated pumping does not help.

Start the car, place you foot on the brake and push and hold it. If the brake pedal very slowly sinks toward the floor, the master cylinder is bad. Of course a leak at the master cylinder means it is bad. Don't ignore any of these 2 symptoms as it can stop working at any moment, and leave you with no brakes. When looking at the master cylinder look at the wall or booster that the master is bolted to. If u see sweating, or paint pielling at the mating the master is leaking from the seals.

The most common symptom of a master cylinder that has failed is that when you stop and hold your foot on the brake pedal it will slowly fall to the floor. This is called pedal fade and means the seals within the master cylinder are leaking. If you push the brake pedal and it does not return it may be defective. You may also see a leak at the master cylinder.

The gasket to your clutch master cylinder is probably broken or cracked. or your master cylinder is bad.

I believe your clutch master cylinder is bad. I replaced mine just last year because I couldn't put my car into gear. Every time that happened I had to open the hood and free the clutch lever because the clutch master cylinder went kaput.

Look for leaking fluid at the slave or master cylinder.

If the master cylinder reservoir is empty, you have a leak somewhere. If the master cylinder reservoir is full, the master cylinder is bad.

May be a bad master cylinder, a bad sending unit from the master cylinder or the parking brake or the parking brake is not completely disengaging.

After you have located the clutch slave cylinder, have someone depress the clutch pedal. You should see the piston of the slave cylinder extend somewhat. If it does not, either the slave cylinder is bad, or the master cylinder, or, there is not enough brake fluid in the system for it to operate properly. Check the level in the master cylinder. If the slave cylinder is leaking profusely, it is probably bad.

the symptoms are that oil will not go throw the brake lines to bleed them and the pedal some of the symptoms are hard pedal you wont be able to bleed your back brakes no oil no back brakes check these first before you change your master cylinder or your brake booster..

It means your master cylinder needs to be replaced or rebuilt. The seals inside the cylinder can go bad and cause this to happen.

Yes. The engine will idle poorly when a vacuum power brake booster goes bad. It can be a source of a large vacuum leak. A bad master cylinder however would have no effect on the performance of the engine.

That depends on where it's leaking out; if it's at the master cylinder, you have a bad master cylinder, if it's at the wheel cylinder you have a bad wheel cylinder if it's at a caliper... well, you get the idea. If you know how to repair a master cylinder, wheel cylinder or caliper, you can often get by with a little savings but it's usually best to just trot down to your local auto parts retailer and get a new or rebuilt one.


First you need to find out if your slave cylinder is leaking clutch fliud.check lines to slave cylinder from master clutch cylinder if no leaks most likely master clutch cylinder bad.

clamp the line to the slave cylinder and mash the clutch pedal. if the pedal gets hard to push,the slave is bad. if the clutch pedal goes down slowly with moderate pressure,the master cyl is bad clamp the line going to the slave cylinder. meant to say that in the previous answer

No, there is no code for a bad master cylinder nor any brake condition. Your light must be diagnosed using a scanner which will narrow down your problem.

Either it or the master is bad. Take the line loose on the slave, hold your thumb over the end and have someone push on the clutch. If the master is good, it will force fluid past your thumb. This means the slave is bad. If it doesn't, then it's the master cylinder that's bad. Slave may be also, but one thing at a time.

The most common way to test this is,at a stop with your foot on the brake, the pedal will very slowly go to the floor, there is a test for this but you need to be good at auto repair.

It may be that your clutch master cylinder is bad, or more than likely one of the internal components within the cylinder, have the clutch master cylinder checked.

Copyright ยฉ 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.