Smolly Posted August 14, 2011 Share Hi All, Please help - I purchased XT brakes, new pads and a new rotors(XT centre lock), but my rear brakes vibrate all the time, and lock up before they slow me down - which turned out to be pretty treacherous in Groot Marico this weekend. My local bike shop seems lost for ideas. Any ideas? Thanks, Neil Link to comment Share on other sites More sharing options...
Dubber88 Posted August 14, 2011 Share Smolster ,what pads are you using currently? Link to comment Share on other sites More sharing options...
Smolly Posted August 15, 2011 Share Hi Dubber, i will have to find out, as far as i know they are resin, but more details I will have to ask the shop Link to comment Share on other sites More sharing options...
CAAD4 Posted August 15, 2011 Share Maybe check if the rotor is not slightly warped. Link to comment Share on other sites More sharing options...
nox1111 Posted August 15, 2011 Share I've had that problem previously - bikeshop also eventiually gave up - new pads did not help, rotors was straight etc...They eventually guessed that it's the odd exception where that frame and brake vibration amplified one another... not so sure about that. I just sold the brakes - they worked 100% on other bikes. and my next set worked 100% on mine. Link to comment Share on other sites More sharing options...
Fitter Posted August 15, 2011 Share This is not an unknown problem. Can be fixed by going to a smaller diameter rotor. Link to comment Share on other sites More sharing options...
Smolly Posted August 15, 2011 Share Hi Domestique, Already dropped from a 180 to a 160, didnt help! Link to comment Share on other sites More sharing options...
King_Crispy Posted August 15, 2011 Share I have a set of juicy 3.5's that I'll swop? Link to comment Share on other sites More sharing options...
banna Posted August 15, 2011 Share I've had that problem previously - bikeshop also eventiually gave up - new pads did not help, rotors was straight etc...They eventually guessed that it's the odd exception where that frame and brake vibration amplified one another... not so sure about that. I just sold the brakes - they worked 100% on other bikes. and my next set worked 100% on mine. Yup, had exactly the same amplification problem. Changed to a heavier rotor and that solved it. Link to comment Share on other sites More sharing options...
Caerus Posted August 15, 2011 Share Hi All, Please help - I purchased XT brakes, new pads and a new rotors(XT centre lock), but my rear brakes vibrate all the time, and lock up before they slow me down - which turned out to be pretty treacherous in Groot Marico this weekend. My local bike shop seems lost for ideas. Any ideas? Thanks, Neil Which XT brakes, the new or old models? Link to comment Share on other sites More sharing options...
Smolly Posted August 15, 2011 Share Hi All, King Cripsy - not at that stage yet, but will let you know. Caerus - its the old model Banna - what centre lock rotor would you recommend? Link to comment Share on other sites More sharing options...
Fitter Posted August 15, 2011 Share Hi Domestique, Already dropped from a 180 to a 160, didnt help! Then try a 120. Link to comment Share on other sites More sharing options...
Smolly Posted August 15, 2011 Share Fitter - would that not be too small ? and what would that for breaking performance? Link to comment Share on other sites More sharing options...
Smolly Posted August 15, 2011 Share What are the chances that it is a problem with the caliper? Link to comment Share on other sites More sharing options...
Gravity Posted August 15, 2011 Share a mate of mine had the exact same problem, when he went from 160mm rotors to 180mm.the solution was to sand down the brake pad slightly. Edited August 15, 2011 by Gravity Link to comment Share on other sites More sharing options...
Smolly Posted August 15, 2011 Share thank gravity, do you know how much? Link to comment Share on other sites More sharing options...
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