Question about 1977 - 1979 Lincoln Mark V Brake Master Cylinder Bleeding Tool Cardon

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Leaking brake fluid behind master cylinder 79 mark v

Slowly leaks while sitting, appears to be coming from master cylinder.

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They r new brakes all the way around the brakes r real hard but if u sit at red they slowly go down

With regards to the "sinking" you describe, I'd look to a bad master cylinder. Could be low fluid in master cylinder or a leak in the system, possibly an air lock too.

May 14, 2016 | Cars & Trucks

1 Answer

Fluid leaking from clutch

Are you loosing brake fluid from the brake master cylinder or the clutch master cylinder ? Either one could leak onto the floor.

Jan 23, 2013 | Ford Fiesta Cars & Trucks

2 Answers

Losing brake fluid with no leak

It's a sealed system, so it's got to be going somewhere, leaking somewhere (or boiling off from severe braking operations over and over). Since you likely haven't experienced extreme braking, it must be leaking somewhere.
You will have to trace all your brake lines from the master cylinder to each wheel to check for any sign of leaking. Front calipers are easy to spot leaks when they leak. If you have drum brakes on the rear, you may need to pull off the drum to check the wheel brake cylinders. Peel back the rubber boot on each end of the wheel cylinder and look for any fluid leaks there.
Another place to check is at the back of the master cylinder. If a seal is bad there, it has been known to leak fluid inside the car, under the dash. Feel around the carpet under and behind the brake pedal for any wetness. If you find brake fluid there, you will need the master cylinder replaced or rebuilt.
Hope you find the problem. Don't forget to check the ABS system and brake lines, too.

Mar 28, 2012 | 2008 Pontiac Grand Prix

1 Answer

While sitting at a traffic light the brake pedal slowly goes down. One pump and it comes back up to normal and holds. This is a '95 LeSabre very low mileage (31,000) very clean car. No signs of brake fluid...

There might not be a leak but I think there is AIR within the hydraulics. So if you have not checked your brake hydraulics for a very long time, it is good to check the master and brake cylinders.
Finally you need to BLEED out the air so that on the first pump you get a hard pedal.
Check at the wheels for possible smear of fluid indicating small leak and air intake.

Apr 05, 2011 | 1995 Buick LeSabre

1 Answer

My dash lights come on when my brakes are pushed in my 93 nissan pick-up

If you mean the brake warning light on the dash is coming on, it is telling you that you have a problem with your hydraulic system, There is a switch that senses an imbalance between the front and the rear brakes. First check your brake fluid, if it's low than you have a external leak. If it's not low, the master cylinder has failed internally.Lokk for brake fluid leaks behind each wheel and at the back of the master cylinder. If you can find a leak or it's not low on fluid you had a bad master cylinder.

Jan 22, 2011 | Nissan Pickup Cars & Trucks

1 Answer

My front driver brake suddenly has no brake fluid going to it. the other 3 brakes work, but i am losing brakefluid and can find no leaks. 1994 pontiac sunbird 3.1 with abs.

Hi. If you are loosing brake fluid, you have a leak somewhere. What I would do is jack your car up, making sure it is safe to go under. I would then make sure the master cylinder was full and then I would ask someone to sit in the driver's seat and slowly pump the barkes with the car running. While under the car, carefully trace all of the brake lines looking for the leak. Also, be sure to check the bottom of the master cylinder for leak. I discovered a small leak behind my master cylinder (against the firewall) that resulted in a slow, difficulat to find leak. I hope this helps. Good luck!

Jan 08, 2011 | 1994 Pontiac Sunbird

3 Answers

Brake pedal sinks 1-2 inches while holding

Sounds like your master cylinder is shot. Go to a parking lot, stop, and pump the pedal a bunch of times. Then get out and see if there is any fluid leaks by any of the wheels. That would indicate a brake line leak. My first guess, however, is your master cylinder.

Jun 02, 2009 | 1985 Toyota Pickup

2 Answers

Air/Hissing Noise from Brake Pedal

this noise is caused by a defective power brake vacuum booster, (big round thing behind the master cylinder) the diaphragm is leaking vacuum.

May 06, 2009 | 1995 GMC Suburban

4 Answers

Brake fluid leak

There is Supposed to be a Gasket Between the Booster and Master Cylinder. If this Gasket is Gone it will leak like this. If it is Still There, You may need a New Master Cylinder or Booster Depending on what you find when you get it Opened up. Please Rate My Response! Thanks!

Feb 06, 2009 | 2003 Ford Windstar

2 Answers

Kia brake prob.

Do you see more smoke than normal from the exhaust?
Check the floor mats on the drivers side for brake fluid, it could be leaking from the master cylinder where the brake pedal connects.

Sep 10, 2008 | 2001 Kia Sportage

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