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  1. #1
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    Shimano XT - Pad Rattle - Normal?

    After installing my new M785 XT Brakes I noticed a rattle sound that seems to be the pads rattling in the caliper when I'm riding fast on a bumpy downhill and not applying pressure to the levers. Anyone else notice this? Do I need to bend the pad springs out a bit?

  2. #2
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    Nah...just get a small elastic band and wrap it around the fins (not fin to fin, but one elastic band per fin). If you can source black elastic bands from inner tubes, you won't even notice them. This is a common fix and should get rid of the rattle.
    Current Stable: 2011 Niner EMD, 2011 Vassago Jabba

  3. #3
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    Thanks!

  4. #4
    Ted
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    I am not loving the same issue. I tried the rubber bands made from inner tubes and it helped a bit but the problem was still there. Any other fixes?

  5. #5
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    My SLX's did that too. Switched to normal non-finned pads and no problems since (with rattling or brake fade).

  6. #6
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    Non-finned pads fixes the problem. XT here.
    I see hills.

    I want to climb them.

  7. #7
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    Anybody ever notice when holding down on the brake, the bike rocks forward and back. It was pretty noticeable on the my front brake. I thought I had a lose headset but its actually the brakes. When you clamp on the lever and rock the bike, you can see the pads moving.

  8. #8
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    Quote Originally Posted by mmanuel09 View Post
    Anybody ever notice when holding down on the brake, the bike rocks forward and back. It was pretty noticeable on the my front brake. I thought I had a lose headset but its actually the brakes. When you clamp on the lever and rock the bike, you can see the pads moving.
    Yes, the pads move quite a bit, IMO. I too thought I had a loose headset, they move that much. Now that I know what's going on, I'm not that concerned about it. I'll probably opt for the non-finned pads when my existing pads are due for replacement.

  9. #9
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    Quote Originally Posted by mmanuel09 View Post
    Anybody ever notice when holding down on the brake, the bike rocks forward and back. It was pretty noticeable on the my front brake. I thought I had a lose headset but its actually the brakes. When you clamp on the lever and rock the bike, you can see the pads moving.
    A lot of disc brakes do this. You'll notice that if you apply more pressure, there is enough friction between the pad and piston and they stop sliding around in the caliper. So squeeze harder when you're actually trying to check your headset.

    Yes, I noticed the rattling noise as well when I installed my brakes. I bent the pad springs a little but now I think I've just gotten used to it. Just a consequence of having the fins on there to dissipate heat. Which IMO is more important than a little rattle.

    Don't think there's really much of a way to solve it.

  10. #10
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    My XTs do not move on a downhill, they work great with very little fading on long descents. Is it really much better with finned pads?

  11. #11
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    Quote Originally Posted by Ted View Post
    I am not loving the same issue. I tried the rubber bands made from inner tubes and it helped a bit but the problem was still there. Any other fixes?
    I noticed this immediately on my Saint breaks, I really don't understand how the pro's who ride this equipment would stand for this.
    I took an old inner tube and cut a section about 3mm wide with scissors. I then wound it between the fins from top to bottom then around the backside of the fin surface. This provides a rubber bumper between the caliper and the pads that has completely stopped the noise. Visually you cant see it and it has not moved or broken at all. It also allows the pads to move freely.
    Stupid you have to go through this to have a silent bike really.......but it works.
    \

  12. #12
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    The Saints on my DH bike have gotten noisy with the rattle. Sort of rattles me when concentrating on the trail. Thanks for the ideas on the fix.


    Edit....

    Just pulled the pads and noticed quite a bit of wear. Maybe the diminished pad size allows less tension on the spring and more wiggle room. Perhaps its sort of a built in alarm system by Shimano letting you know its time to replace the pads. I stretched the spring out a bit to apply more tension. Will also pay attention if replacing with new pads helps.

  13. #13
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    Quote Originally Posted by Miker J View Post
    ...Just pulled the pads and noticed quite a bit of wear. Maybe the diminished pad size allows less tension on the spring and more wiggle room.....
    The gap between the pad surface and rotor stays more or less constant since the pistons advance to adjust for pad wear. With worn pads, the pistons and backing plates are closer together, so spring tension would be greater, all else being equal.
    Do the math.

  14. #14
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    You can help it by bending the pad spring so that the fingers sit more parallel than in the 'V' shape they sit in as standard. I also find that the noise goes away once the brakes collect s bit of dirt, as long as you don't clean them again ;0)

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