Any techniques on removing a siezed piston from a rear master cylinder? I have the entire assembly removed up to that point, but cannot get the piston out. I have tried pentrating oil, compressed air.... everything I can think of, but no dice on removing the piston.

Scott

 

try putting the caliper in a vise . not too tight and have it so the small end of the piston is up . heat up the caliper some and try using a punch to hit it out . or in the bleeder hole sray some liquid wrench and try to tap it out . then in working it back and forth to try to free it up .

 

no no, the rear master cylinder, not the rear caliper. The piece that is actuated by the rear brake lever.

Scott

 

o . ok . well almost the same thing . spray penitrating fluid down the bolt whole and then turn it over and try punching the valve down and work it loose that way .

 

If compressed air didn't do it I'd get a new master cylinder, old one may have rust/corrosion built up in there that will cause more problems down the rode.

 

Did you take out the circlip?

 

Yes, everything except the piston is out.

Scott

 

Maybe try giveing it shocks and plenty of penetrating oil, After that I don't know. BTW was the bike left idle that this happened?

 

I bought the rolling chassis used, it sat outside for a few years. Alot of things had to be unsiezed but this is a PITA!!!!


Scott