Hacked off as have just had a reba fitted by LBS but sadly they didn't have time to fix the breaks. Anyway my fault as I know it was a tad temperamental. Question is there anything I can do at home to free it up? It's borderline unridable (wheel turns maybe one rotation before sticking)
Also when it take it in should I ask/assume seals will be replaced when its stripped down
ta
MC
had the same problem myself when I bought a bike second hand.
A few websites / forums say pump them out and spray qt85, but then some say this contaminates the DOT. I just got the pistons out, cleaned with IPA, actually replaced the rear ones with new phenolic as they are only a fiver from CRC and they were in bad nick, and rebled. Took ages becuase I was new to hydrualic discs, but they work beautifully well now...
What are phenolic - different brand of piston - sorry if this is a daft question!
Phenolic pistons are a plastic not Metal ones like you have atm. I have a spare set of phenolic pistons and caliper seals if you are interested.
May be interested - guess they are new and would be for any version of mini? (mine are 5 -6 years old)
How much were you thinking?
thanks
MC
and they're the orginal mini's rather than the mono mini's look like this
thanks
Take the pads out and pump the lever a little bit [i]gently[/i] to push the pistons out. You may find one moves more easily - hold it in and pull the lever again to get the other one to move. Clean the exposed part of the piston and lube - some folk use brake fluid - I use silicone / rubber grease. Push piston back in and refit pads - this might work if the piston is not in too bad shape. You can work the piston in and out a few times
Otherwise its a case of removing the pistons completely and cleaning them up - if you do this you might get away without new seals but I wouldn't do it without new seals to hand as seals are cheap and there is a good chance you will damage the seals.
Don't use GT85 or similar to lube the pistons - it might contaminate the seals and make them either swell or leak.
cheers TD but PK_XC sorted me out with some new pistons.