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Pushing the pistons back with a screwdriver to put some new pads in my K18 rear caliper I seem to have cocked something up. When I pressed the lever gently to make sure they were moving they came out a little but totally refused to go back with the end result I can't even get the old pads back in let alone the new ones. Any theories on my hamfistedness and any ideas on how to fix it?
Probably got the pistons a bit skewed, doesn't take much to get them out of line.
If you can, gently get a lever in and push them back square, you may have to alternate gently pulling the brake lever and the lever in the caliper to get it to move back. Have fun
right Tim.
I have managed to get the pistons apart but every time you get one piston back into the caliper the other one pops out. It is driving me mad and I have started looking at brake offers at Merlin when I am sure a bit of common sense will do the job. Any ideas?
Tim is right, probably just a bit skewed on the pistons. I think what you will have to do is give them a bleed whilst levering the pistons back into position.
start by opening the bleed nipple at the lever and set up something to collect the fluid when it comes out.
Now start pushing the pistons back into place. it should be easier as there wont be any pressure due to the nipple being open.
then put the old pads back in, and put a spacer in between so they dont move.
now bleed them according to the formula instructions.
Hope this helps, its what I did with the same problem
I found my pistons to be a little overfilled when i wore out the first set of pads on my k24's (that cheap batch merlin did 18 months ago that propel were a bit funny about iirc). I could never get both pistons all the way back even though they moved in and out quite freely. In the end I opened the bleed port, let a bit of fluid out and then bled them properly with an avid bleed kit. (opening the port will allow ari in as well as fluid out i discovered!) No problems since though.
But if you are really fed up with them I'll give you a few bob for them: I'm thinking about another set. They are awesome brakes.