vacuum leak in cabin area?

blackwarbeast · 02-20-2009, 08:59 PM

95 gmc 1500 xcab...everytime I press the breaks I hear a ssssssssssssssss sound...like a vacuum type hiss. the truck is currently only braking with the front two brakes, the back two needs the works (shoes, hardware kits, etc.) . Im pretty sure the sound is brake related somehow.

Kennyray · 02-20-2009, 09:03 PM

sounds like your vacuum booster has a leak. does the pedal firmer than normal on the first push with engine off. does the feel change at all when you push the brakes?

blackwarbeast · 02-20-2009, 09:52 PM

the pedal is usually always soft as ****...not firm at all, just enough to stop the truck when stopping at a light, sign, etc. I figured this was due to it needing brake work. also, the brake line had to be patched with compression fittings but I had a shop bleed the brakes and whatnot. but your right maybe it is something with the booster..if so how do I fix that?

silverhairdeere · 02-20-2009, 10:30 PM

first check the vaccum hose and the plastic piece , if ok replace the vaccum booster .

shd

leolkfrm · 02-21-2009, 10:48 AM

If you are patching for leaks, it's time to replace! compression should NOT be used on brakes, only flare, bubble,etc. They make an easy to work with soft line, that bends and flares nice. Do yourself a favor and do it right, the consequences aren't worth it!

scavanger · 02-21-2009, 09:05 PM

Quote:

Originally Posted by leolkfrm

If you are patching for leaks, it's time to replace! compression should NOT be used on brakes, only flare, bubble,etc. They make an easy to work with soft line, that bends and flares nice. Do yourself a favor and do it right, the consequences aren't worth it!

I agree, the lines will blow out of those compression fittings on a panic stop.

Scav.

02-20-2009, 08:59 PM	#1
blackwarbeast Senior Member Join Date: Feb 2009 Posts: 52	vacuum leak in cabin area? 95 gmc 1500 xcab...everytime I press the breaks I hear a ssssssssssssssss sound...like a vacuum type hiss. the truck is currently only braking with the front two brakes, the back two needs the works (shoes, hardware kits, etc.) . Im pretty sure the sound is brake related somehow.

02-21-2009, 10:48 AM	#5
leolkfrm Senior Member Join Date: Mar 2008 Location: N.Y. Posts: 4,300	If you are patching for leaks, it's time to replace! compression should NOT be used on brakes, only flare, bubble,etc. They make an easy to work with soft line, that bends and flares nice. Do yourself a favor and do it right, the consequences aren't worth it! __________________ 4 wheels move the body 2 wheels move the soul B.W.A.I

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02-20-2009, 09:03 PM	#2
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	sounds like your vacuum booster has a leak. does the pedal firmer than normal on the first push with engine off. does the feel change at all when you push the brakes?

02-20-2009, 09:52 PM	#3
blackwarbeast Senior Member Join Date: Feb 2009 Posts: 52	the pedal is usually always soft as ****...not firm at all, just enough to stop the truck when stopping at a light, sign, etc. I figured this was due to it needing brake work. also, the brake line had to be patched with compression fittings but I had a shop bleed the brakes and whatnot. but your right maybe it is something with the booster..if so how do I fix that?

02-20-2009, 10:30 PM	#4
silverhairdeere Senior Member Join Date: Feb 2008 Location: land between the lakes tn Posts: 1,183	first check the vaccum hose and the plastic piece , if ok replace the vaccum booster . shd