Rear break started binding on a month or so ago. I assumed it was the usual fazer brake issue, but when I had a look the pistons were clean. I tried to wind them back into the caliper with a piston tool but they wouldn't budge. It was only when I opened the bleed screws they went back. So all was well for two weeks or so and then they stuck again. So this time I took each piston out to check and they were clean as was the bore in the caliper. However, there was a small bit of rubber in brake fluid. So I order and fitted a new hose (still had the original one on and it's a '98 machine so it was getting on for 16 years!) and flushed the system out - including a few more small fragments of rubber. All seemed fine for a couple of week and then yesterday the ****ing thing stuck on again.
The only thing I noticed was when I took the pistons out they were difficult to push back into the caliper - should they be easy to move (with no fluid in and bleed valves open)?
Any suggestions?
Current plan is to re-visit the caliper on friday. I'll pop the pistons back out and pull the seals out (I have a new set), I may split the caliper to have a good look inside (my local bike parts shop stocks the internal o-rings).
