Brake pedal--hissing......

[SafeAirOne]

Mark--Were you referring to someone else, as I received no PM?

Oh yeah...sorry--It was rastaman looking for a booster in this post. Lots of brake issues on this board lately. It's getting hard to keep track.

[Opabob]

Reviving this thread to ask if anyone is running with the vacuum booster disabled permanently. My booster started hissing a day or so ago (both off brake and on brake, tho differently). I disconnected and plugged the vacuum line and the hissing stopped. From this I have to assume the problem is a worn booster. To be honest I have not noticed needing that much more brake pressure to stop so I am wondering just how useful this booster was in the first place. I also noticed my brakes stopped squeaking after disabling the booster. I am wondering if the booster has been slowly dying, and the hissing was its last gasp so to speak. The squeaking started after new shoes were put on and the first time they were used heavily to stop going down hill. I checked the cylinders and the wheels did turn without drag when I jacked up the wheels, so I am a bit mystified about the squeaking.

[mearstrae]

Sounds like your booster hasn't been working for a while, if you feel little difference when you plug the vac line. The hissing is, as you say, was probably the last gasp for the booster. I think you'll find an improvement when it's replaced. As for the squeaking brake shoes, I don't know. One problem at a time, I think.

'95 R.R.C. Lwb (Gone but not forgotten)
'76 Series III Hybrid 109
'70 Rover 3500S