Hissing sound until I push down on the brakes and then it stops. It is easy to push down on the brake so after reading past forums its not the brake boost?...... The check engine light is on so other forums tells me is it the vacuum???? Is this correct? Is this serious issue? Can I still drive the car? Is this a costly issuse to fix?
Ya'll should not be driving it and git yer mechanic to take a look at it asap. And start saving as it'll cost ya heaps..
SOURCE: Hissing noise when releasing brake pedal
Sounds like your brake booster but can't be sure until I know what kind of truck or car you have....
SOURCE: 2005 Ford Escape Hissing sound
The power brake booster has a bad valve. I can't suggest where to find a new valve for it, but you can buy a rebuilt replacement. They are usually not hard to put on.
SOURCE: 2003 Ford Expedition, low idle, no power while driving.
sounds like water in gas. add gas line antifreeze. 2 bottleshould do it.
SOURCE: My 2003 ford expedition just started a hissing
most likely have a bad diaphram in the brake booster that hisssing sound is vacuum leaking under hood there will be hose going to brake booster unhook hose and pinch off hose start car does hissing sound disappear if so bad booster
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