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06-04-2009, 12:48 AM
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#12 |
 ULTIMATE
Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008
Location: USA, CT
Posts: 13,460
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The brake booster works off vacuum. Shut the car off, press the brake pedal to the floor. Repeat. If on each additional pump the pedal goes less far the booster is fine. If you can continue to press it all the way to the floor either the check valve or the booster has an issue.
You can check the check valve by removing it and blowing through it. You should be able to blow through the threaded side (that screws into the booster), but not the hose nipple side (that accepts the vacuum line). The hissing may be a vacuum leak in the hose, the check valve or the booster. The above will help figure out which... |
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