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hissing noise when brake applied Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine and Car Noises steve1 User Aug 4, 2010, 9:26 AM Post #1 of 3 (2663 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 Aug 4, 2010, 9:30 AM Post #2 of 3 (2660 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 (2655 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.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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