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  1. #1
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    Issue with Screaming XT Brakes, Help!

    I'm using XTR M970 Dual control levers with the XT hydraulic calipers , Rear disc is Shimano 160mm and frt is an Avid 185mm.
    They work fine, just scream a lot always. I've sanded the discs nd pads and uses alcohol to clean and no change. The pads don't have any brake fluid/oil/chainlube/grease, nothing on them, I was very careful during bleeding them not to get anything on them. I've tried re-bedding them in and they still scream, making me crazy! Help!
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  2. #2
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    Which one is noisy? Or are both equally noisy?
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  3. #3
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    Thanks for the reply, my bad; yes it is BOTH brakes...........
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  4. #4
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    Double checked the caliper alignment?
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  5. #5
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    They seem to be parrallel, the discs don't rub.
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  6. #6
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    if they are in alignment, make sure that both pistons are moving. you can get noise sometimes if you have a sticky piston and the one moving has to push the rotor into the other pad.

  7. #7
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    If you are running the stock XT metallic pads, try switching to organic. This fixed the problem for both me and a buddy of mine.

    -D
    Last edited by Diesel~; 10-13-2009 at 09:34 AM.

  8. #8
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    Did you find a fix? The rear brake on one of my bike screams like a banshee when I get on it. It make this humming/vibrating noise when I'm maxing it out. It doesn't rub. I haven't cleaned pads yet but maybe I should try that first. I'm wondering if it just needs bled or something though. Kinda weird... anyways, I'm curious if you fixed yours...

  9. #9
    A Midwesterner in Europe
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    Did you check to make sure that the mounting tabs are faced?

    If there is paint in between the frame and where the caliper mounts that could cause your noise.

  10. #10
    29 some of the time...
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    Pad compound is the easiest way to quiet noisy brakes. But most of the resin/organic pads don't bite as hard (EBC's are pretty close though) and they fade more on long heavy descents.

    You can also chamfer the edges of the pads, that may help.
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  11. #11
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    This is a post resurrection I know, but I had really quiet brakes, then I put a new set of XTR pads in and they howled like mad. I got another set of XTR pads and they were quiet. I only use sintered pads.
    Could it be that there is just a bad batch of pads out there?

  12. #12
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    I run XT 775's and had replaced my worn XTR pads with Cool Stop. Brakes howled like crazy. Picked up another set of XTR (organic) and problem solved. The Cool Stops weren't the exact size (although meant for my set), which was creating an alignment issue. Lesson learned I guess; don't skimp on pads.

  13. #13
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    I have a set of the older XT 765's that have worked great for years. I put them on a new Ventana SS and they worked fine for awhile. The rear now vibrates badly, and I can't get rid of it. I had the LBS check the tabs, and they are faced correctly.

    The inboard piston doesn't seem to want to move as freely as the outboard one. I tried unsticking it by forcing it out, putting a bit of TriFlow on it. I will be trying new pads next.

    But, does Shimano make rebuild kits for these?

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