Question about 1995 Jaguar XJ6

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How to rebuild brake master cylinder - 1995 Jaguar XJ6

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U NEED A MANUAL, AS IF DONE WRONG "!!!!!, PLUS SEALS WHICH NORMALY COME WITH INTRUCTIONS, THINK SAFTEY, IS A HEAVY CAR TO STOP WITH NO BRAKES

Posted on Feb 02, 2009

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Brake fluid going into boosters arming coming on


didnt specify vehicle if brake fluid is leaking into power booster will need to replace the master cylinder --one or both seals have damage
How To Replace Rebuild Your Brake Master Cylinder the link may not be your vehicle but shows the inner workings and seals of master cylinders

Sep 28, 2016 | Cars & Trucks

1 Answer

The front drivers side break keeps locking. I have replaced the caliper and now when I pump it no fluid is coming out from the line.


Did air get into the master cylinder? If you can, try bleeding the master cylinder. The fact that you aren't getting any fluid out of the line suggests that the master cylinder isn't pumping fluid.

Master cylinders are (usually) on a split circuit system - that is, the front left brake is on the same line as the rear right. The front right brake is on the same circuit as the rear left.

A point to be aware of is when bleeding brakes/doing brake work and if the master cylinder runs dry, is that a seal inside the master cylinder can fail/twist over and not pressurise that particular line, even though it may pressurise the opposite brake line.

I'm in the UK. I have a 1998 Jeep Grand Cherokee 4 litre, which I am slowly rebuilding. Three weeks ago I fitted new front brake rotors, new front callipers and pads. I've been rebuilding cars for over 40 years now and have done countless brake overhauls.

.. and could I get a hard pedal after the job was completed? I must have bled the brakes three times a day for a week and couldn't get a brake pedal. I phoned a full time mechanic I know - he came and tried to bleed the brakes three times and couldn't get a hard pedal.

That's when you think 'The master cylinder was working before I started the job so it must be still working now'.

I fitted a brand new master cylinder and because some parts for older jeeps are hard to come by in the UK, I fitted a second hand proportioning valve. When I bled the brakes again the pedal became rock solid. Fixed.

You're probably fed up with your braking problem now ... and apparently this 'no fluid/brake pedal' is more common than you may think.

Try bleeding the master cylinder if you can. If you suspect that it isn't fully working - try an overhaul kit which is cheaper than a new master cylinder.

As for changing the proportioning valve .. that's your decision. My brakes now work though the truth is I don't actually know which was at fault as I changed both the master cylinder and proportioning valve at the same time. Maybe both were at fault, for whatever reason. I genuinely don't know.

The positive aspect is that you are doing your own work and know what you're doing. You're saving on labour charges.

Apr 18, 2016 | 1998 Dodge Grand Caravan

2 Answers

Brakes sink to the floor


by stating that your pedal sinks to the floor, you leave 3 options open 1.) the master cylinder seal is bypassing allowing the fluid to bleed by the proper correction is to rebuild the master cylinder.
2. One of your drum brakes has a wheel cylinder that has failed causing a noticable behind the tire leak (most common) correction is to replace all brake hardware and wheel cylinder.
3. One of the brake lines is cracked,broken, inspect for leaks and replace with new line.
4. notice on disc brakes if a brake caliper fails (part that squeezes brake pads to rotor) you will have the same symptoms of a broken wheel cylinder, this would of gradually occured feeling a heavy pedal or pulsation.

Feb 19, 2011 | 1994 Toyota 4Runner

2 Answers

Brake fluid is leaking out around my brake pedal


you have a bad break master cylinder seal. replace master cylinder unless you have the expeirence to rebuild master cylinder

Jan 22, 2011 | 1990 Geo Prizm

2 Answers

Brakes squishy no leak


Mushy / squishy brakes are usually caused by the brake master cylinder seals failing. You can buy a rebuild kit or a re-built replacement master cylinder. I would recommend the rebuilt master cylinder as all the detail work has already been accomplished and it is not a huge expense. The key is to make sure that your use a bleeder kit to "Pre-bleed" the master kit before installation. Your making sure that the master cylinder is free of air before installation. If you instal it with air in the system it wil take you the better part of a quart of brake fluid to bleed the whole brake system via the wheel cylinders. What will happen is after you install the master cylinder the brakes would still be mushy and until you got the residual air out of all of the lines it would appear and act just like it did before you changed the master cylinder.

Thanks for using FixYa,

Kelly

Jun 03, 2010 | 2000 Ford Taurus

2 Answers

For the past week or so there's been oil of something leaking onto my brake pedal, dont know where its coming from?? toyota camry '90


It is probably brake fluid from a bad master cylinder gasket . This can be fixed with a master cylinder kit. Do you have problems with your breaks ? If it is a standard tranny instead of automatic it could be fuild from the clutch. Check the fluid levels for any or both cylinders.

Feb 28, 2009 | 1991 Toyota Camry

2 Answers

1973 F250 TRUCK 4X4 BRAKE PEDAL GOING TO THE FLOOR


Master is internally bypassing : replace or rebuild.

Feb 20, 2009 | 1989 Chevrolet K1500

1 Answer

Brake pedal will not depress


Let the fluid out of the master cylinder or from a line. If the pedel  then goes down w/o the fluid, then the booster is working ok. Rebuild or replace the master cylinder. 

Dec 28, 2008 | 1992 Chrysler New Yorker

1 Answer

I have a 1997 ford f150 . when i give it brakes my pedal goes all the way down . could it be my master cylinder?


yes it is most likely the master cylinder take one of the brake lines off and hold your finger over the port on the master cylinder and have someone slowly push the brakes in slowly if fluid doesnt spray out you either need to rebuild it or have it replaced a rebuild kit is cheaper than the cylinder but its your decision

Dec 01, 2008 | Ford F-150 Cars & Trucks

1 Answer

Braking


take the top off the master cylinder and while someone is pushing the break pedal down, looks for bubbles coming up in the master. Master cylinder probably needs rebuilding or replacing.

Jun 26, 2008 | 1995 Honda Accord

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