Hissing under the dash

[83ChevyK5Blazer]

So I'm getting a nice leak under the dash when the engine is running. When I push in the brakes it stops. Is this a leaking brake booster? If I replace the booster do I have to drain and rebleed the master?
Thanks cody.

 

[sweetk30]

if you tore out or messed with the cruise control there is a vac supply hose to the 2nd half of the brake light switch. this will give you that sound . had this bite me in the wallet years ago.

and if replacing booster dont need to blead brakes. 2 nuts and pop off and tilt out to the side the master . then swing back over and bolt up when done that easy .

 

[83ChevyK5Blazer]

I never had cruise so probably the booster then

 

[454Sub]

could possibly be the ac/heater door vac lines as well, mine sprung a leak and i spent months tryin to find that little ****. But the brakes thing makes me think more of a booster problem.

 

[wasted wages]

Could be a snake...




Seriously....my vote is booster going bad...

 

[83ChevyK5Blazer]

I hope its not a snake lol

 

[sweetk30]

na there just on airplanes. http://en.wikipedia.org/wiki/Snakes_on_a_Plane