Disc Brake adjustment, driving me mad, any tips?

russ_gillespie

Hey all,

I've got Avid Juicy 3s on my bike and I made the mistake of pulling the brake while the front wheel was off, and they've never been the same since. I've eased the pads back into their positions with a flat tool a number of times but no matter how many times I adjust them I cant stop them rubbing on the disc.

Ive loosened the whole calipre and, pumped the brake, held it, and tighten them again. I've done this several times but they still rub. I just can't seem to get it right.

Is there something I can do? Anyone got any tips? The rear one is fine, it's just the front that's the problem. The pads look physically too close together compared to the rear ones.

Any advice much appreciated.

supersonic

Remove the pads and push the pistons all the way back into their bores. Also chek that the rotor is true.

russ_gillespie

ok ive just tried that, the pistons are in as far as they'll go.

I've now got it to rub only slightly, but when applying the brake whilst moving im getting very severe vibrations coming up from the disc. I assume this means they are misaligned?

I have checked the disc and it's dead straight no bends or anything.

Am I fighting a losing battle here or should I keep trying the same things? The bike is 3 weeks old and im considering taking it back to the shop.

supersonic

I take it you have read the instructions, or got a set? If you are really struggling, then take it back, but I think its a case of perseverance, then letting them bed in. Sometimes a very slight bit of rub will soon die away. Do check the rotor bolts are torqued properly.

nicklouse

slacken bolts. apply brake and rotate wheel for at least on revelotion and then keeping presure on the lever tighten bolts. spin to check then use.

russ_gillespie

Hi,

yep Ive read the instructions and have done everything I can find on this subject, several times! The rotor bolts do seem torqued correctly and te rotor itself is dead straight.

Nicklouse I have tried that method many times, and everytime they still rub. As I said in the previous post the rubbing is now down to a minimum but its still there, but now Im getting big vibrations when I apply the brake, I didnt have that before. There must be another issue there somewhere.

I think it's gonna have to go back to the shop.

Thank for your help chaps.

Docgeoffyjones

Are both pads moving at the same time? and are they moving the same distance? if not that could be causing the rub. This is usually identified by the disc flexing slightly when you apply the brake?

russ_gillespie

Yes both pads mve at the same time, one pad is closer to the disc than the other but we're talking about 10ths of a mm nothing major. Both pads looks too close to the disc in my opinion, much closer than on th rear disc.

ddraver

http://www.bikeradar.com/forums/viewtop ... t=12539467

same problem..........discussed yesterday