Question about 2001 Buick Century

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A few seconds after brakes are applied the pedal starts to fall to the floor. When I pump the brake pedal I here a hissing noise coming from the vacuum booster.

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You have two problems here, your master cylinder has a leaking seal, the low pedal is resault, the power brake booster rubber diaphram is damaged and leaking from the brake fluid that is getting into it from the master cylinder, these are sold as a unit that has been rebuilt.

Posted on Sep 28, 2009

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Try replacing the Vachum booster Brake check valve costs 415.00 at the dealer. If it is going to the floor you need to bleed the system.

Posted on Sep 28, 2009

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  • Bruce Hathcock Sep 28, 2009

    Like emissionwiz said you have both out but replace the master cylinder first, i said replace the Booster check valve not the booster, the check valve can do the same thing, you can also buy a used one from a junk yard and replace the booster that way. but check the check valve first. it is inlineon the hose going into the booster. Start engine and run pull booster hose out and hold end of hose turn engine off does the hose still have vacuum? if yes then it's booster valve if no then it's booster diaphram.

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1 Answer

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hissing sound is a vacuum leak somewhere on the power assist part of the system as in a bad booster..try this test..with the car off..push the brake pedal down a few times and release all the vacumm and see how far the pedal goes down..after a few pumps with your foot it should become hard and drop just a bit..once it feels"solid' or hard..hold the pedal down with moderate pressure.. and start the car back up..the pedal should drop a bit further but less than halfway.. if it drops further it needs attention..good luck especially if it goes almost to the floor..

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yes but up to a point
the brake pedal should move about 1" to take up the pedal free play and then be applied smoothly as you press further
the harder you press the more solid stopping action you will get
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