I've noticed a hissing sound coming from the engine compartment of my 05 GMC CCSB for a while. I finally tracked it down to a vacuum leak from the brake booster where the master cylinder bolts to it. Is ther some sort of gasket or seal there? Would the booster be bad? Is there a cheap fix for this?
mine did this, i replaced it with a larger 06 setup
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
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it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
So is my booster bad?
I actually replaced a brake booster on an 02 Envoy, because It rusted through right underneath the master cylinder in a small pinhole. I had bought a replacement master cylinder, because that's what I thought it was but it wasn't. Mine didn't have a seal between the two, good luck!!
O ring between the master cylinder and booster.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Got a part number? I called the local GM dealer and it doesn't show an o-ring or gasket.
Nope. My 2007 gmt900 shows to have one but i do not have the pn.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
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