Rotor rub : what do you do when you've tried everything ?

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  • Rotor rub : what do you do when you've tried everything ?
  • Premier Icon neil the wheel
    Subscriber

    Check the pistons have been pushed all the way into the caliper before re-positioning it over the rotor.

    Premier Icon scc999
    Subscriber

    Is it only rubbing on one section of the rotor or all of it?
    Both pads or just one?

    Premier Icon iainc
    Subscriber

    Don’t align them by slackening the bolts and pulling the brakes. Align them, with pads pushed fully retracted, so that the rotor is central in the calliper – view with a torch behind to check. Then slowly torque up the bolts, checking that rotor remains on centreline of calliper.

    nickfrog
    Member

    Fitted some new wheels today and both rotors rubbing. Undid caliper bolts, pulled brakes and tightened again : this has no effect.

    Tried and checked if rotors out of true so I dicked about with them but to no avail.

    What’s my next step please ?

    Premier Icon sweaman2
    Subscriber

    Is there a washer between bolt and caliper? If there isn’t every time you tighten the bolt it’ll slightly walk the caliper and you’ll get rubbing.

    daern
    Member

    Don’t align them by slackening the bolts and pulling the brakes. Align them, with pads pushed fully retracted, so that the rotor is central in the calliper – view with a torch behind to check. Then slowly torque up the bolts, checking that rotor remains on centreline of calliper.

    This, although I do it with the pads pulled in, to take into account any uneven action on the pistons. Either way, I’ve found setting the calipers by eye to be more accurate and almost as quick to do as the old “loosen and pull” approach.

    ChunkyMTB
    Member

    iainc – Member

    Don’t align them by slackening the bolts and pulling the brakes. Align them, with pads pushed fully retracted, so that the rotor is central in the calliper – view with a torch behind to check. Then slowly torque up the bolts, checking that rotor remains on centreline of calliper.

    This ^^^

    Don’t use the ‘slacken off then pull the brakes trick’. Also you a light source behind to check as above.

    PeterPoddy
    Member

    There’s quite possibly too much fluid in the brakes and the pistons aren’t retracing far enough. No brand is immune to this IME. I usually take the wheel out, crack the bleed nipple on the calliper, and simultaneously push the pistons apart with a screwdriver. Do this carefully and slowly and just let literally 2,3,4 drops of fluid out. Refit wheel and have another go. Usually works. Avid/SRAM brakes are the worst for this, though, obviously.

    Premier Icon cloudnine
    Subscriber

    Hayes disc brake caliper alignment tool also takes guess work and faff out of the equation..

    nickfrog
    Member

    Thanks everyone – using the visual method has helped – and in particular it has helped spotting the bends in the rotors !!!

    95% of the way there now which will have to do – I’ll probably buy new rotors as mine have been bent so much and in so many directions…

    Although I realise new rotors can come pre-bent !!!

Viewing 11 posts - 1 through 11 (of 11 total)

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