Mac
Well-known member
- May 3, 2021
- 1,653
- 3,354
Yes, a thread on something so elementary I am embarrassed to even start it.
I made all new lines, new turning brake master cylinder, rebuilt the main master cylinder (roughly 3 years ago but the car has sat 2 years), took the calipers apart and cleaned/inspected them. I knew this would be a pain since I have to push new fluid and get it flowing. It went fairly well and got fluid flowing and bubbles out. Now the issue is it's not holding pressure. Nothing is leaking and if you pump it up, it's a nice pressure for the pedal and turning brake. Then you switch to a different caliper and no pressure.
I've bled all 4 ports on each caliper. No change. When I have good pressure, I see the calipers/brake pads moving as they should, but again, as soon as you move to another caliper, no movement, no pressure.
SO...I'm thinking fuck it, just get a new master cylinder. It's the only common part in all this. I'm not going to rebuild it as it's an old CNC unit that is no longer around and you can't get rebuild kits, regardless of what anyone tells you, they just don't fit right. I can get a Jamar or Empi replacement that bolts up to the pedal unit.
Am I missing something? Could there be a big fucking bubble stuck that just isn't budging? I've put 2 quarts of fluid through this thing. It's small 2 seater. Not a lot of length or complexity to this system. No proportioning valves or anything like that.
I really don't want to troubleshoot by remove and replace at this point. Definitely not looking forward to all new calipers as I don't want to refab spindles and mounts.
I made all new lines, new turning brake master cylinder, rebuilt the main master cylinder (roughly 3 years ago but the car has sat 2 years), took the calipers apart and cleaned/inspected them. I knew this would be a pain since I have to push new fluid and get it flowing. It went fairly well and got fluid flowing and bubbles out. Now the issue is it's not holding pressure. Nothing is leaking and if you pump it up, it's a nice pressure for the pedal and turning brake. Then you switch to a different caliper and no pressure.
I've bled all 4 ports on each caliper. No change. When I have good pressure, I see the calipers/brake pads moving as they should, but again, as soon as you move to another caliper, no movement, no pressure.
SO...I'm thinking fuck it, just get a new master cylinder. It's the only common part in all this. I'm not going to rebuild it as it's an old CNC unit that is no longer around and you can't get rebuild kits, regardless of what anyone tells you, they just don't fit right. I can get a Jamar or Empi replacement that bolts up to the pedal unit.
Am I missing something? Could there be a big fucking bubble stuck that just isn't budging? I've put 2 quarts of fluid through this thing. It's small 2 seater. Not a lot of length or complexity to this system. No proportioning valves or anything like that.
I really don't want to troubleshoot by remove and replace at this point. Definitely not looking forward to all new calipers as I don't want to refab spindles and mounts.
