Question about 1989 GMC Sierra

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Losing brake pressure when i hit the brakes but all lines are good and have been bled

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That is a classic example of a failing brake master cylinder.

Posted on Mar 27, 2011

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Brake lines probably broke. brakes stopped working suddenly.


There are many things other than brake lines that can cause braking loss. Investigation will reveal the issue. First, check fluid level in the Master Cylinder. If the level is normal, you don't have any broken lines/leaks. If the fluid is full and you have no brake pedal/braking power, chances are the Master Cylinder itself has failed. There are o-rings internal to the M/C that can fail, and when this happens, you will lose pressure to wheel cylinders/calipers and, as a result, lose your brakes.

If the fluid has leaked out, then you need to find out fro where. This is not too difficult normally. Fill the M/C with fluid and have someone press the brake pedal while observing the underside of the vehicle. You should see fluid dripping from somewhere, often near one of the wheels. You can have a leaking caliper/wheel cylinder, brake hose, or metal brake line. Once you determine what part has failed, you can purchase and replace the defective part. Brake calipers, wheel cylinders, and hoses are fairly simple to replace. Brake lines are more difficult, as they require shaping, cutting, and the creation of couplings. After repairs are done, the brake system must be refilled and all air bled from the system or braking will not be satisfactory.

Feb 16, 2016 | 1999 Buick Regal

1 Answer

I have changed the rear rotors and brake pads, bled the brakes after putting itall back together. Seemed to have brakes but then shortly thereafter they are like a sponge. Last time I tried bleeding them...


Hi, bleeding your rear brakes with engine running, you should get enough pressure out of the lines to squirt 3-4 feet. In other words, good pressure. If all you get is a trickle, you probably have a bad master cylinder. Just because its full of fluid, does not mean the seals arent shot. If you have bled them in order, left rear,right rear,left front,right fornt and have bled them enough to get fresh fluid out of each one without achieving good solid pressure at all wheels, replace your master cylinder. There is a proportioning valve, but usually it will affect only one wheel when going out, usually the left rear.
Brake pedal height comes from the rear brakes, so if you have bad pressure there, you will never get a good pedal. Eventually with a bad master, your brakes will go completly out..Mike

Jun 20, 2011 | 2001 Dodge Ram 2500 Truck

1 Answer

My kid bought a 99 Grand Am, the brakes were spongy and had to be pumped. The car now has new front calipers, pads, and new master cylinder. We bench bled the master cylinder and bled out the brakes. The...


If the car has Drum style rear brakes, make sure the adjustment is good. It takes a lot of fluid to activate them.
PS. I assume you did bleed the rears.

Apr 12, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

Just installed rebuilt master cylinder but still getting lots of brake pedal travel after bleeding master and twice on all entire brake line system. what could be the problem here


If you are losing brake fluid you still have a leak in the system, if not then take it into a garage and have it pressure bled.

Sep 02, 2010 | 1991 Plymouth Sundance

2 Answers

95 maxima finished changing brakes/bled little press no pressure


Check your master brake cylinder for vacum leak.

Jan 05, 2010 | 1995 Nissan Maxima

1 Answer

Oil missing out of master cylinder oil on rear line going to back brake


You have a raptured brake line. Mostly from rust. Everytime you apply pressure to the brake pedal that is why its taking brake fluid. Keep adding brake fluid to your master cylinder-don't let it go dry or you will lose all of your back brakes if you didn't already. You have to have your brake lines replaced and have your brakes bled. Should be about a $100 job at a good brake shop.

Oct 17, 2009 | 1997 Cadillac DeVille

1 Answer

Brakes vibrate and lose pressure at very low speeds


First check your brake fluid level if its low add fluid. If this is OK have your front rotors check they may need turned have the pads checked at the same time. If your brake fluid was low you may have air in the brake line and they will need the air bled out.

Sep 14, 2009 | 2003 Jaguar X-Type

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