Stuck brake piston
 

Rebuilding my calipers and 7 out of 8 brake pistons came out without hassles. the 8th is driving me nuts!

I thought compressed air would nail it, but with my compressor at max pressure, the piston just moves forward slightly then then retracts when the air is off.

Only thing I can think of is piecing the caliper back together (refitting the 3 pistons I have already removed), reattach the line, re-bleeding and then try and clamp the 3 pistons that are free moving to force the 4th out.

But, before I go to all that hassle, I thought I wold check if anyone else has any other clever ideas?!

Thanks
Luke

Re: Stuck brake piston
 

No other clever ideas, that is what I would do.

Re: Stuck brake piston
 

put some penetrating oil around the seal area (be prepaid to replace the seals) leave it for a bit, then get the air line on them when the piston moves back after you remove the line like you say it does it should drag some oil back past the seal with it repeat the process .

well it worked at my collage on a very old and rusty calliper

Re: Stuck brake piston
 

Luke try a small pair of small molegrips and a small rag and try unscrewing it from the body.

Worked on an opposed two pot

Re: Stuck brake piston
 

please note it does not have to be a small rag ..... thank you come again ;)

Re: Stuck brake piston
 

:smt097

Makes life easier and normally has to be chucked with the fluid that is stuck in the vacum behind

Re: Stuck brake piston
 

hehe

i know was just been a t*t :D

Re: Stuck brake piston
 

I know!

Get back in the garage and break something! :mrgreen:

Re: Stuck brake piston
 

i will be in a min the drill coming out and so is the broken exhaust bolt !

sorry for the derail

Re: Stuck brake piston
 

forget moleys mate-cut brush shaft to about 8 inches, shape end to fit tightly into piston, hammer in , turn and pull out at same time -take you minutes and you'll no screw piston

husky