hissing sound when braking

swisherred

Senior Member
Joined
Jan 19, 2016
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Location
winston salem, nc
1967 Newport Custom
When Im parked and depress the brake pedal to put it in gear I hear a hissing sound...like a vac leak or something, but there is no effect on the brakes...varying pressure on the pedal varies the sound. Is my booster going bad? Something else?
 
Check the grommet where the vacuum line runs into the booster.
 
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