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Hissing sound... Brake booster?

jimmy18thing

Jr. Member
Joined
Mar 12, 2008
Messages
128
I have a hissing sound coming from my brake booster area when I shut my engine down. I can't seem to pinpoint if it is the booster for sure or something else. Any ideas? Anything I can test? My brakes don't feel funny at all.
 

broncnaz

Bronco Guru
Joined
May 22, 2003
Messages
24,341
Disconnect the booster and plug the line do you still get a hissing sound? Most likely the booster is going bad its just not to the point where its totally failed yet and really hissing and causing the engine to run bad.
 
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