Rear brake pads caught on fire!

I heard back from the 928 racer who had the issue, he said:
"could be master cylinder related or mal-adjustment of the free play in the brake pedal. That would affect front and rear, not just rear. Brake piston doesn’t withdraw past the pressure relief hole in the MC. Every application of the brakes builds more pressure till all 4 stay “on”.

Well it sounds like we were all wrong.
I would like to know why the master is heating up and is it just a matter of it being over full or the cap not venting?

James, this was on Dannyfumi's '87. We'd replaced dang near everything and done multiple bleeds to no avail. We decided to replace the master cylinder because it was the only thing not new, and bingo, it worked.

WOW...that is crazy! Like you I would never have thought it was that MC...like you I would have replaced everything else and that would have been last. At least my "logic" (as suspect as it is) matches up with a pro! I hope I NEVER see anything like that with ANY of my cars!

In conclusion...

Got the Master Cylinder replaced and now the rear brakes seem to be fine - no more spontaneous phantom rear braking. Man, this whole thing was such a drag

Julian

masterchan;4851 wrote: In conclusion...

Got the Master Cylinder replaced and now the rear brakes seem to be fine - no more spontaneous phantom rear braking. Man, this whole thing was such a drag

Julian

ROTFLMAO

I am glad you found the problem.
We need to document this somewhere Stan so that others can view the info.
What do you think?