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  1. #1
    LA CHÈVRE
    Reputation: Dan Gerous's Avatar
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    XT caliper has crooked piston?

    This week, I noticed a new anormal sound on my bike, a rub of some sort. After a quick check, I noticed one of the piston of my rear XT caliper isn't straight. It doesn't seem to want to go back to it's normal position by pushing on it (I don't want to push too hard and risk damaging the thing). It still brakes but rubs constantly with a very annoying sound and I'm afraid it could damage it beyond a repairable state.

    The thing is, I'm leaving on a bike trip tomorrow... Should I keep riding like it is or should I try to force the thing back? Any brake specialists?
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  2. #2
    UKMac
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    How old are the pads?

    It looks to me like they are quite worn because the piston is extended fairly far out. I know on my hopes I've never seen the pison out that far. I'd replace the pads.

    To get the piston to retract you may have to move it out a bit first to square it up. Do this by removing the pads and holding the other one in place with a small screw driver, then squeeze the lever slightly. Stop as soon as the piston moves; you don't want to pop it out!!! Once free you should be able to push it back in normally.

    Also, are you sure the calipers are square to the roter? That much out of square seems a bit unsual for well shimmed brakes. It could be the picture or the fact I'm not familiar with Shimano disc brakes, but if the caliper is square I wouldn't expect that to happen.

    Any way good luck and let us know how it turns out.

  3. #3
    just along for the ride
    Reputation: Brown_Teeth's Avatar
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    Change those pads ASAP, go with the semi metallics, the resins just don't last or grab. As for the alignment issue just follow the shimano suggestion in squaring the caliper to the rotor (no shims needed, loosen both bolt, apply the lever than tighten). I have been very happy with mine but indeed my back brake does drag a bit since it seem the self adjusting from the banjo side.

  4. #4
    LA CHÈVRE
    Reputation: Dan Gerous's Avatar
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    I agree about the pads, my next set are going to be the metallics. The pads are not too old and not too thin either, it just happened one day, one of the piston was crooked, the other side is still square with the rotor as is the caliper itself. Very weird, something must have hit the pad or something... I didn't try too much to replace it yet, I just looked at the issue this morning before I left for work. I'll put my hands to it tonight.

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  5. #5
    UKMac
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    Be sure to inspect the old pads

    check to be sure that the pads are worn evenly; uneven wear is a sign of a non-aligned caliper. If the caliper is not alinged properly the pads can wear significantly faster, which could explain your situation.

  6. #6
    LA CHÈVRE
    Reputation: Dan Gerous's Avatar
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    After a closer inspection, you guys were right, the pads are dead. Unfortunatly, I didn't have time to get and install new ones before my trip (changing brake pads on those brakes without a workstand is very touchy) so I took my other bike. I'll get the metallics.

    By the way, anyone ever went to Burke VT to ride the Kingdom trails? Very nice trails down there. I would have had even more fun on my FS bike but it was still a blast on the hardtail!

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