Question about GMC Cars & Trucks
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: very high idle
probably is brake booster if you can hear hissing sound, would not advise disconnecting hose, would be extremely hard to stop the vehicle, a dangerous situation. also check for vaccum leaks on intake manifold. follow brake booster hose to engine and check for leak from there
Posted on Nov 30, 2008
SOURCE: idle problem when brakes applied
Sounds like you have a vacume leak on your brake booster ....with engine running have someone press the brake while you listen on the driver side by the master cylinder the large vacume line going to the booster behind the master cylinder is most likely the vacume leak...and if so you can get what you need at your local parts store ...
Posted on Nov 20, 2009
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