Question about 2001 Chevrolet Silverado 1500

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Power assist leaking between master cylinder

Is the power assist seal repairable or must it be replaced?

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If it is leaking fluid between the booster and the master cylinder, you need a new master cylinder. If it is leaking vacuum when you push the brake pedal, you need a new booster and master cylinder.

Posted on Jul 15, 2009


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Posted on Jan 02, 2017

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SOURCE: The seal between my master brake cylinder and vacumn assist leaks

u need to replace brake master cylinder is leaking from the seal behind the master cylinder assy easy to replace

Posted on Mar 28, 2010

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1 Answer

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

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Why is there an air leak in master cylinder area?

air leaking noise is coming from master cylinder area
Haroon, The booster is hooked up to a vacuum line off the engine or should be. Get your self a mechanics stethoscope to locate and repair leak.

Mar 30, 2016 | Cars & Trucks

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1994 gmc 3500 leak between master cylinder and power brake boost anybody have a picture

The rear seal of the master cylinder plunger is leaking, you must replace the master cylinder to correct this.

Jul 09, 2012 | 1994 GMC Sierra

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The seal between my master brake cylinder and vacumn assist leaks

u need to replace brake master cylinder is leaking from the seal behind the master cylinder assy easy to replace

Mar 28, 2010 | 1993 Ford F150 SuperCab

3 Answers

Brake pedal goes to the floor? replaced all the brakes and bled them. worked for very short time and now the pedal goes to the floor.

If the fluid level is staying constant then it sounds like the brake master cylinder or the master cylinder booster. If the seals are bad on the master cylinder the piston just goes through the fluid. Many boosters use air pressure to assist in the braking proces and it could have a leak.

Mar 14, 2010 | 1996 Chrysler Town & Country

1 Answer

Cant get the braks to bild presure

Then you have to have leakage someshere, or, the Master Cylinder is bypassing brake fluid under & around the seals within itself, needing replacement.

The hydraulic system is straightforward. Push the brake pedal, it pushes a rod that pushes the seals inside of the master cylinder that pushes the brake fluid through the lines to the porpotioning valve, which pushes the fluid to each wheel & if there are pads or shoes at those wheels and nothing leaking, the pads/shoes have to work unless the master cylinder is leaking.

Check inside of the vehicle, around & under the carpet behind the brake pedal. If you ae losing or leaking fluid & you can't find it anywhere else, you should find it in the floorboard of the car.

If the system has been opened lately for repairs, then this could be due to air in the system and the need to bleed the brakes. You'll need to have an assistant help with that, work from the farthest point away from the master cylinder with bleeding at each wheel & work to the closest one last. If you do this, keep the master cyliinder full at all times after each brake at each wheel is done. good luck

Jan 31, 2010 | 1999 Oldsmobile Alero

1 Answer

Master seal leak.

It's not usually called this, perhaps it was a "main seal leak"? Suffice it to say that it is not possible to replace this seal without removing the engine or the transmission as it resides behind the flywheel. Or perhaps they said "master cylinder leak", in which case it is a matter of replacing the brake master cylinder with a rebuilt unit or at the very least, the seals on top of the master cylinder that mate with the brake reservoir.

Dec 20, 2009 | 2000 Nissan Xterra

2 Answers

My 1994 buick lesabre's brakes will not work. I have low brake fluid and the brake pads were just replaced. My friend said that there was brake fluid leaking from the car and that I might need a master...

if you can see a good amount of wet brake fluid between the brake master cylinder and the brake booster. and you have been adding fliud often,you could have a bad master cylinder. it has to be replaced not rebuilt. you however may have a far more common problem, a rusted through brake line.have someone pump the brake pedal, than look under the car for a brake fluid leak ,repair as needed. than bleed the brakes for a good hard brake pedal
good luck chris

Mar 18, 2009 | 1993 Buick LeSabre

2 Answers

Clutch or master problem?


Dec 16, 2008 | 1993 Nissan 240SX

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