Disc brake rub

[dave123456]

Hi, I’ve noticed that on pretty much every mountain bike I’ve had the disc brakes seem to ‘creep’ on if they haven’t been used for a while, going uphill and that sort of thing.

The only thing that seems to back them off is a slight application, then it happens again.

I’ve tried the usual pushing the pistons back etc and I can’t seem to solve it.

I’ve had it on shimano XT, slx and Hayes gram.

Anyone got any suggestions? It’s frustrating.

Thank you

[stuarthat]

Sometimes it helps to slightly bend the spring retainers out a little .

[Watchman]

Calipers need lining up properly. None of ours do this (four people / four bikes) but i maintain them and make sure they don't.

Also, hydraulic or cable disks? Cable ones may suffer from cable friction preventing the pads from parting properly.

[E65Ross]

If the pistons have been pushed back, then either caliper not lined up properly (loosen the bolts, press the brake lever firmly, and whilst holding it, tighten the bolts) or a sticky piston - if hydraulic.