crause
Well-known member
- Joined
- Sep 4, 2003
- Messages
- 266
- Location
- Louisiana
- Corvette
- 75 Convertible-steel blue / 2000 lt. pewter conv.
Quick description of what I did: My 1975 Corvette front calipers were leaking so, replaced both front calipers, with new pads and new GM rotors. Installed new master cylinder. I bled the system and was satisfied with the braking function. Took the car on three local outings over about a 3 week period and all good. The car sat for about a week and I needed to move it from its parking location on my driveway. Started right up and when I went to put by foot on the brake pedal to shift gears, the pedal went all the way to the floor. Didn't feel like it would build up pressure when I pumped it. I didn't have time to work on it right then so I very slowly moved the car and had only very minor braking when the pedal would hit the floor (brake light came on the first time it went to the floor).
Opened the master cylinder expecting to find the fluid gone but both were full (front was about 1/8" down). When I found some time to look at it again, I noticed that if I pumped the pedal with the engine off, the pedal would build up but with pressure it would slowly begin to fall. With the engine running, it was almost impossible to build up any pedal and would almost immediately go to the floor. No sign of leaking brake fluid anywhere and don't know quite where to start. I hate to just start replacing parts but I am thinking that I may have gotten a defective master cylinder and the fluid is getting past the piston seals somehow. This was a new master cylinder not a rebuilt.
If anyone has had a similar situation and can offer some insight I would greatly appreciate it. :confused
Opened the master cylinder expecting to find the fluid gone but both were full (front was about 1/8" down). When I found some time to look at it again, I noticed that if I pumped the pedal with the engine off, the pedal would build up but with pressure it would slowly begin to fall. With the engine running, it was almost impossible to build up any pedal and would almost immediately go to the floor. No sign of leaking brake fluid anywhere and don't know quite where to start. I hate to just start replacing parts but I am thinking that I may have gotten a defective master cylinder and the fluid is getting past the piston seals somehow. This was a new master cylinder not a rebuilt.
If anyone has had a similar situation and can offer some insight I would greatly appreciate it. :confused