1998 Toyota Camry hissing sound when pedal is depressed

1998 TOYOTA CAMRY
135,000 MILES • 4 CYL • FWD • AUTOMATIC
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MASTERSGT
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  • 3 POSTS
I recently noticed a hissing sound when the brake pedal is depressed, it lessens or stops hissing when I have the pedal fully depressed hard (like at a stop light). The brakes seem to work fine. But a couple of times when I had to stop fast it seemed like a lot more pressure was needed...as if the brakes weren't working as well as they should. I had brakes and rotors replaced at the dealer a few months ago. Am i in for another huge repair bill?
Dec 4, 2007 at 10:30 AM
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MHPAUTOS
  • CAR REPAIR CONTRIBUTOR
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Hi there,

Your problem is the brake booster, this is leaking. The hissing noise is engine vacuum, which the booster uses to assist with brake pedal pressure, the brakes will feel hard and be some what inifeciant with a faulty booster.

Mark (mhpautos)
Mar 11, 2021 at 12:43 PM
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