I have an older mechanical shimano disc brake. After adding new pads the moving pad keeps rubbing the disc rotor, even when the cable is as slack as possible and the mount is moved to its extreme position. The issue of course seems to solve itself as I ride or if I sand the pad slightly, but is there something I am missing.
by reynhaim
6 Comments
Is it a cup and cone hub? There might be a 1mm spacer missing between locknut and cone or swapped on the other side, leading to an offset wheel.
I know this can happen because i do exactly this on purpose to mount 9s compact cassettes to 7s non compact hubs.
Even if this is not the case, you could just pick a 0.8mm M10 washer and put it between the cone and the locknut to solve your problem.
I have no idea what to do, but i moved my head to the left two times to get a different angle until i realized that this is an image.
If you recently installed new pads yo u have to reset and center the caliper.
Couple of things to check: 1. is the wheel fully in and centered in the dropout? 2. Is the wheel true (Google zip tie wheel trueing) 3. Is the rotor true and properly torqued in there? If it isnt I highly recommend one of those disc brakes trueing tools, they are cheap and make little adjustments easy 4. After checking all that you can also try getting a disc brakes alignment tool..basically a folding piece of metal you insert between the rotor and caliper after loosening the mounting bolts..squeeze the leaver after the tool is in and tighten the bolts and it should mostly center if #1-3 above are complete
When you are going to put in new pads you need to push the pistons all the way back in. Use a plastic tire lever so you don’t damage the pistons. Then put in the new pads, then put the wheel back on. Squeeze and release the lavers, the pads/pistons will move to where they need to be.
Easiest fix is to put a suitable spacer washer on the shaft between the frame and the wheel bearing / hub nuts, then you will be able centre the calliper with ease 😉