Hissing Sound Brake Problem

Hello all!

I have a 1987 with a V6, p/b, a/c. Recently I started hearing a hissing noise under the dash when pressing the brake pedal down and the brakes are not as effective as they should be.

I can say it sounds like a vac. leak and am wondering what under the dash could be the culprit?

Thanks!

Brian

Check your brake booster under the hood.

Ditto on the brake booster. You may need a new one.

No noise under the hood...brakes stop ok as far as power boost goes...just spotty as the hissing varies with the leaking vacuum

But the noise sounds like a vac. hose under the dash...is there a vac. line under the dash for brakes

Thanks!

Brian

Sorry for the multiple replies...it's 110 degrees here and I'm working on this thing a little at a time

The noise under the dash is right where the brake pedal rod meets the firewall and goes into the booster.

It is a vacuum leak right where the rod goes in

Any help?

Thanks all!

Brian

More than likely you have an internal leak in your booster.

Bummer

New booster time?

Brian

yassir, booster vacuum leak at firewall, yassir ,install new or rebuilt unit and noise will go away, yassir , it will

thanks all

Brian

Is there a repair kit for these boosters?

Thanks!

They are non-serviceable.