UKPOC forums

Brand new rear calipers, neither retracts nor extends, means I'm probably doing something wrong. No brake fluid as I thought it's mechanical, tried bleeder open, closed, everything. The Allan screw in the back just turns with no success.

Yes, not functioning correctly

Kit

Hard to believe but if it's happening.....................
Choice is send them back or take apart and find out what's wrong.

It's bonkers that it's both of them. I've taken the Allan screw out the back and its brand new - and the teeth inside look good too. Really bizzare. The old (I'm guess O.E) still operates fine! I've tried the Allan screws in that one and it works too. Struggling to think what else to try.

May be to ‘Company’ that re-manufactured the caliper, did not know what they were doing

Kit

Strange, what company refurbed them have you tried a squirt of wd 40 down the
adjuster hole

You shouldn't have been able to take that screw out until you removed a very deep recessed circlip.
Did you do that ?

jrh wrote: ↑

Mon Jul 05, 2021 7:25 pm

You shouldn't have been able to take that screw out until you removed a very deep recessed circlip.
Did you do that ?

The Allen screw will come out, if you can get the Allen key to stay in it as you pull it out.

When the screw goes in, is it mating with the worm gear that makes the piston move?

Do you mean
Worm Gear

Kit

yes worm ear has to engage, have you tried old screw in the new cailper