1992 Buick Lesabre Brakes

Tiny
JANMARKIL
  • MEMBER
  • 1992 BUICK LESABRE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 16,400 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?
Saturday, October 18th, 2008 AT 3:42 PM

8 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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).
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Saturday, October 18th, 2008 AT 4:03 PM
Tiny
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There seems to be no brake fluid leaking on the ground. Does that mean anything further?
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Saturday, October 18th, 2008 AT 4:13 PM
Tiny
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I followed your instructions. Nothing happened.

What exactly is a booster? How do I look that up on a site, which sells auto parts?
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Saturday, October 18th, 2008 AT 4:22 PM
Tiny
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The brake booster is the big round thingy behind the brake master cylinder that provides the brake assist during braking.


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



Below is your power barke booster


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

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Saturday, October 18th, 2008 AT 5:12 PM
Tiny
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Is it complicated to install?
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Saturday, October 18th, 2008 AT 5:15 PM
Tiny
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No just remove the brake master cylinder and disconnect the booster from under the dash
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Saturday, October 18th, 2008 AT 5:19 PM
Tiny
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Would you happen to know the cost of the booster?
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Saturday, October 18th, 2008 AT 5:35 PM
Tiny
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About $71.65 as shown above for yours
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Saturday, October 18th, 2008 AT 7:15 PM

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