Mechanics

BRAKES

1992 Buick Lesabre

Brakes problem
1992 Buick Lesabre 6 cyl Front Wheel Drive Automatic 16400 miles

My brakes are going to the floor. The brake fluid was only about 1/4 low. I filled the container up. I have to keep pumping them up to work. I hear air from the inside of my car, near the brake pedal. Would this be a Master Cylinder problem or a Wheel Cylinder problem?
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JanMarKil
October 18, 2008.



Replace the brake master cylinder if there's no leakage at the wheel cylinders/calipers

A quick way to check the vacuum booster is to pump the brake pedal several times with the engine off to bleed off any vacuum that may still be in the unit. Then hold your foot on the pedal and start the engine. If the booster is working, the amount of effort required to hold the pedal should drop and the pedal itself may depress slightly. If nothing happens and the vacuum connections to the booster unit are okay, a new booster is needed (the vacuum hose should be replaced, too).

Rasmataz
Oct 18, 2008.
There seems to be no brake fluid leaking on the ground. Does that mean anything further?

Tiny
JanMarKil
Oct 18, 2008.
I followed your instructions. Nothing happened.

What exactly is a booster? How do I look that up on a site, which sells auto parts?

Tiny
JanMarKil
Oct 18, 2008.
The brake booster is the big round thingy behind the brake master cylinder that provides the brake assist during braking.


http://www.2carpros.com/forum/automotive_pictures/12900_booster_2.gif



Below is your power barke booster


http://www.2carpros.com/forum/automotive_pictures/12900_brake_booster1_1.jpg


Rasmataz
Oct 18, 2008.
Is it complicated to install?

Tiny
JanMarKil
Oct 18, 2008.
No just remove the brake master cylinder and disconnect the booster from under the dash

Rasmataz
Oct 18, 2008.
Would you happen to know the cost of the booster?

Tiny
JanMarKil
Oct 18, 2008.
About $71.65 as shown above for yours

Rasmataz
Oct 18, 2008.