Hi there, I had my calipers rebuilt by PMB Performance and they look great / work great. Unfortunately I'm having an issue where both of my front caliper bleed screws are seeping a tiny bit of brake fluid. I have tried tightening them down as much as I dare but still the leaks persist. I have a call into PMB for advice but thought I'd ask here. The bleeder screws are new, the calipers are OEM and have been rebuilt. A few options come to mind: 1. Loosen and tighten the bleed screws about 10 times to 'set' the new bleeders to the existing caliper. 2. remove the calipers and using valve lapping compound with a wooden dowel (shaped to appropriate angle) gently resurface the sealing seat in the caliper. 3. see if I can find my original bleed screws and reinstall those... 4. install SECO seals (anybody happen to know what size / material?) Appreciate any tips. Pic for attention Cheers, Mike Image Unavailable, Please Login Image Unavailable, Please Login
I can't comment unfortunately on the Ferrari calipers. I had mine done by PMB and all was good. But I have had issues with StopTech calipers leaking, it was a manufacturer defect. Did they leak before you sent them off? If not something must have happened there.
They didn't leak before restoration but that was with the old bleeder screws - the rebuilt calipers came with new bleeder screws which I installed (and are leaking). I suspect the bleeder screw seats (in the calipers) are somewhat worn and the original bleeder screws had a similar wear pattern from 40 years of use. I think my next step will be to see if I can find my original bleeder screws (I tried to save everything) and see if those look worn at all - if yes try to reinstall those originals. Also pretty tempted to get SECO seals but not sure what size. Always something... Thanks! Mike
For context these are the type of seals I'm talking about -- just not sure which will fit the ATE Calipers... https://www.pegasusautoracing.com/productselection.asp?Product=3202
I had the exact same issue on my 328 rear calipers. Rebuilt the calipers and after, the bleeder valves leaked at the threads. I cranked down on them with no luck. Even after replacing with new valves they still very slightly leaked. I did not want to replace the calipers. I ended up using Fluoramics LOX-8 Green Full Density Thread Seal Tape. I only wrapped outermost threads, leaving the first 2-3 threads unwrapped, for fear of any tape tearing off inside of the calipers. About 2 years later and many HARD braking sessions with super hot brakes, and still no leaks. I know I'll get a lot of flack, but look it up. The stuff is practically indestructible. Working for me.
