Rear Caliper and MC problems...

[KEITH KRAUSE]

#1 cause of your problem (as you describe it) is old piston seals not allowing the piston(s) to back off enough or at all.
And just in case you may be thinking about it, never use anything aggressive to clean up the piston bore. There's typically only a .001" service wear limit on the bore. Some finger polishing with Blue Magic/Semi-Chrome or similar polishing compound will usually shine up things well but I've never gotten any more aggressive than that. Same treatment for the piston.
When you re-fill, I suggest the newer "5.1" brake fluid. Glycol based but a much higher boiling point than Dot 3 or 4.

[TheCafeKid]

#1 cause of your problem (as you describe it) is old piston seals not allowing the piston(s) to back off enough or at all.
And just in case you may be thinking about it, never use anything aggressive to clean up the piston bore. There's typically only a .001" service wear limit on the bore. Some finger polishing with Blue Magic/Semi-Chrome or similar polishing compound will usually shine up things well but I've never gotten any more aggressive than that. Same treatment for the piston.
When you re-fill, I suggest the newer "5.1" brake fluid. Glycol based but a much higher boiling point than Dot 3 or 4.

Thanks Keith i think that may indeed be part of it, and i have new seals and pistons on their way. I shall update!!