DJ23GSX
20+ Year Contributor
- 773
- 4
- Feb 22, 2004
-
W. Springfield,
Massachusetts
I'm having an issue with my brakes after the car sat in out in the freezing cold for a week. I went to move it the other day and the pedal went straight to the floor and barely stopped by the end of the driveway. I pumped it a few times and it felt normal again but if I let it sit for a minute it goes right to the floor again and needs to be pumped up. The brakes were perfectly fine the day I parked it and I have been daily driving it for a month straight before hand with no issues.
So far I've checked the whole system for hydraulic leaks (no obvious ones found yet). I pulled the master cylinder out of the brake booster and that was dry as a bone. I pulled off the brake booster hose and tested the check valve and that was good. The car doesn't appear to be losing fluid at this point either.
Can a master cylinder be bad and not leak?
A few other odd things I've noticed are:
My boost gauge looses some vacuum while I pump the pedal up
My wideband also goes a bit lean while pumping up the pedal
After I pump up the pedal and hold it tight the pedal gradually goes to the floor right after I rev the engine and it pulls in extra vacuum as the rpm's come down. More vacuum = pedal dropping
At this point I'm just looking for some other suggestion of things to look for or at.
So far I've checked the whole system for hydraulic leaks (no obvious ones found yet). I pulled the master cylinder out of the brake booster and that was dry as a bone. I pulled off the brake booster hose and tested the check valve and that was good. The car doesn't appear to be losing fluid at this point either.
Can a master cylinder be bad and not leak?
A few other odd things I've noticed are:
My boost gauge looses some vacuum while I pump the pedal up
My wideband also goes a bit lean while pumping up the pedal
After I pump up the pedal and hold it tight the pedal gradually goes to the floor right after I rev the engine and it pulls in extra vacuum as the rpm's come down. More vacuum = pedal dropping
At this point I'm just looking for some other suggestion of things to look for or at.