Hi Folks,

Last summer 2 of my front brake pistons (on left, one right side) got stuck, so I disassembled the calipers, removed dirt, oxidation and so on, installed new seals...
Now it happened again :-( How do I clean this stuff correctly, so it wont happen again?

Harry

 

Most folks just replace them with rebuilt units. Did you hone the cylinders? Are they 4 piston or single piston? If they stuck before, did you find anything that caused the sticking?

 

After you clean the bores/pistons up (can be cleaned with crocus cloth) make sure all old fluid, etc is out of the caliper. A lot of brake clean does wonders. Usually the lower pistons will "freeze" because of the condensation etc. that lingers in the lower part of the caliper. I rebilt mine (4 piston) 5 years ago...No problems.

 

Yep. But just very carefully. Was afraid the system would be leaking.

4. So it was a little bit of work ;-)

Well, I think it can happen after 17 years...

 

You are right. Both lower pistons where stuck, the upper two where ok. The damn plastic boots that cover each piston seem to be pretty useless :-(

Harry

 

Actually the sediment/condensation forms on the INSIDE of the calipers and that is what causes the sluggish pistons.

 

how hard is it to rebuild a single piston caliper??