Rear calliper piston not winding in

lowwn · Postby **lowwn** » Sun Mar 08, 2015 2:57 pm

Today I decided to install new pads and rotors for the rears and the fronts but when I went to do the rears, turning the allen key didn't pull the piston back or even push it forward enough for the pads to touch the rotor. New calliper? could I rebuild it? can I just replace that thread somehow?

project.r.racing · Postby **project.r.racing** » Sun Mar 08, 2015 4:23 pm

is the bleed valve open?

lowwn · Postby **lowwn** » Sun Mar 08, 2015 7:22 pm

I fixed the problem. Just winded the grub screw all the way out then used a c clamp and the old brake pads to very carefully push the piston back in then winded the grub screw back in and the mechanism works perfectly now.

aka_juffa · Postby **aka_juffa** » Sun Mar 08, 2015 7:31 pm

Did you check the slide pin on the rear brake in question ? If not maintained correctly the slide pin can corrode and cause the problem as reported. Using the G clamp may have been enough to free it. You should check all of the slide pins at least once a year and use an appropriate lubricant. A small sachet can be bought at Super Cheap and will last for some the.

J

lowwn · Postby **lowwn** » Sun Mar 08, 2015 9:06 pm

The side that I had this problem with was also a bit harder to take the slide pin out which could have caused the problem. I greased it with what came with my pads and ill inspect the slide pin next weekend, thanks