XT brakes wont stop vibrating

[Smolly]

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

[Dubber88]

Smolster ,what pads are you using currently?

[Smolly]

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

[CAAD4]

Maybe check if the rotor is not slightly warped.

[nox1111]

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.

[Fitter]

This is not an unknown problem. Can be fixed by going to a smaller diameter rotor.

[Smolly]

Hi Domestique,

 

Already dropped from a 180 to a 160, didnt help!

[King_Crispy]

I have a set of juicy 3.5's that I'll swop?

[banna]

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.

[Caerus]

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?

[Smolly]

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?

[Fitter]

Hi Domestique,

 

Already dropped from a 180 to a 160, didnt help!

 

Then try a 120.

[Smolly]

Fitter - would that not be too small ? and what would that for breaking performance?

[Smolly]

What are the chances that it is a problem with the caliper?

[Gravity]

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

[Smolly]

thank gravity, do you know how much?