Finally I bought my new hydraulic disc brakes (Shimano M-446) and installed it on my bike . It was a little difficult to adjust the calipers , because the space between the pads is smaller than on my previous brakes (Hayes Stroker Ryde). But finally I had managed to align them properly and went for a test ride . When I sat on my bike I heard the rotors rubbing but only on cornering and turns . I got out of it and rotated the wheel but everything was OK when. What a mystery ? Why the rotors are rubbing only when I am sitting on the bike ?
How much do you weigh? What fork do you have? What wheel set do you have?
It could be one or more of the following:
- QR/Axle isn't tight enough
- Rotors aren't tightened to proper spec
- calipers aren't tightened to proper spec
- the fork is flexing
- the wheel is flexing
I'm a heavier rider (+/- 230lbs) and I ran into this problem early on with XC/trail spec wheels and forks to the point it really held me back from progressing as a rider. If you are more than say 190lbs you need to approach bike/component selection differently. Remember: cheap, light, strong - pick 2.