Micro adjustment of brakes - help!

[Kuroblack350]

Hi all

Bought a new Trek 6300 as a treat for myself last weekend, and have been getting back into riding over the last few (dry!) days.

It has disc brakes, which is a new thing for me. At the moment I think the front *just* catches, as I can hear it whine when stationary (spinning the wheel) and feel the vibration stop when I gently touch the disc (if that makes sense).

So, is there any way of micro-adjusting these things? More than happy with their performance, but just want it to be perfect!

Thanks all

[Matt106]

I know it sounds stupid but have you undone the wheel held the brake on then done the wheel up? It may align the wheel a bit better.

Also check to make sure the disc isnt bent.

If they're hydraulic they might need bleeding, if its a new bike from a shop they should do this for free.

[Raven Flyer]

If it is just touching, it is perfect.

[anonymous-user]

A slight constant rub that is almost undetectable that's fine and actually as mentioned right or preferable, intermittent rubbing and noise is not.

I'm assuming you have hydraulic avid juicy 3's on them, you tend to find the the disc will not be centre in the caliper rather than the pads not returning on release.

Possible causes
1 your quick release is too tight or
2 too loose
3 the wheel isn't seated correctly in the drop outs
4 the caliper or disc isn't fitted correctly
5 the disc is warped

4&5 are unlikely, try a few different strengths on the quick release not massively different, I always over tighten everything and this made a significant difference. Also try putting the wheel in with bike upside down rather than leaning over the handle bars to do it, it may seat better in the dropouts when doing it that way.

Edited by anonymous-user on Tuesday 24th August 11:30

[Kuroblack350]

Good stuff all - will give the suggestion a go

Thanks

[Pablo16v]

It does sound from your description that the disc is ever so slightly warped. Even brand new discs can suffer this if they haven't been handled correctly but if you can't hear or feel it when riding and the brake performance is good then I wouldn't worry too much. A warped disc can be trued again using a small adjustable spanner but I only resort to that when the disc gets a good thump off something and starts rubbing badly.