hissing noise when brake applied - Engine and Car Noises


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hissing noise when brake applied

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Auto Repair Home>> Automotive Repair>> Engine and Car Noises

steve1
User

Aug 4, 2010, 9:26 AM

Post #1 of 3 (2674 views)

hissing noise when brake applied	Sign In

96 jmc jimmy 4.3l hisses under dash when brske is applied

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 4, 2010, 9:30 AM

Post #2 of 3 (2671 views)

Re: hissing noise when brake applied	Sign In

Some slight noise could be normal but if constant hissing it probably has a bad power brake booster.

See if when vehicle isn't running if you get one more power assisted feel then pedal will firm up with subsequent trys.

There's hose to manifold vacuum, a check valve on the booster and the booster is right behind master cylinder. All must be intact,

T

steve1
User

Aug 4, 2010, 1:40 PM

Post #3 of 3 (2666 views)

Re: hissing noise when brake applied	Sign In

hissing is very loud inside truck as brake is applied. if car is running and brake is pumped several times it firms up like the booster does not work. but will change booster anyway. thank you.

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