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Gary, GMC Technician
Category: GM
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Experience:  15 years gm master tech/15 years ASE master tech
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How can you tell if your brake booster is bad?

Resolved Question:

How can you tell if your brake booster is bad?
Submitted: 5 years ago.
Category: GM
Expert:  Gary replied 5 years ago.
usually if a brake booster is bad the brake pedal will be rock hard and there is almost no assist to help push the brake pedal down.OR you will hear a big hissing noise or air excaping noise when you push on the brake pedal with the engine running
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