The rear disc brake hits the rotor at a certain spot, but the other spots are fine. What does this mean? When I spin the wheel, it spins nicely until it goes to that spot and slows down.
My wheel doesn't look untrue. Is there such thing as untrue discs?
Disc Brake Maintenance
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- Cinder
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Re: Disc Brake Maintenance
Postby Cinder » Wed May 26, 2010 6:31 pm
Yup, discs can get bent for sure...
There is actually a tool for fixing it, but it is far from high tech and, at a guess would say you could do the same thing with some patience and a pair of pliers (basically just bends it back).
There is actually a tool for fixing it, but it is far from high tech and, at a guess would say you could do the same thing with some patience and a pair of pliers (basically just bends it back).
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Re: Disc Brake Maintenance
Postby simonboya » Wed May 26, 2010 6:38 pm
How did they get bent??? I rode it lightly and its literally a 7 day old bike...
If I take it back to the bike shop, will it be fixed in less than 10minutes?
If I take it back to the bike shop, will it be fixed in less than 10minutes?
- wombatK
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Re: Disc Brake Maintenance
Postby wombatK » Wed May 26, 2010 6:54 pm
Firstly, have you removed the wheel and put it back in crookedly (i.e. so that the disk is not parallel to the pads, and/orthe wheel is not properly vertical) ? Or have you crashed it or whacked it against anything ?simonboya wrote:How did they get bent??? I rode it lightly and its literally a 7 day old bike...
If I take it back to the bike shop, will it be fixed in less than 10minutes?
If not, take it back to where you bought it from - it's likely to be faulty manufacture or assembly and should be covered by your warranty.
Cheers
WombatK
Somebody has to do something, and it's just incredibly pathetic that it has to be us -Jerry Garcia
Somebody has to do something, and it's just incredibly pathetic that it has to be us -Jerry Garcia
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Re: Disc Brake Maintenance
Postby trailgumby » Wed May 26, 2010 7:45 pm
I've had issues with disc rotors in the past having "thick spots" - on my first bike, it was both rotors! I've got an XT one on my workshop shelf with the same problem. If that's the issue, it's a warranty job.
If it is simply a little bent, that can happen quite easily. A bump against a door, leaving it leaning against something... you can do it without noticing. When they're new and havent been through many heat cycles, the act of hard braking and getting them hot and a sudden cool-down from a creek crossing can do it too.
The good news is it's easy to fix. Youtube has numerous help videos on the subject. You just need a small shifting spanner clamped down over either side of the brake track, and gently but firmly bend the rotor to the side. Don;t use pliers - the serrations in the jaws will mark up your brake track and make your brakes feel horrible to use.
My discs are rarely perfectly true. So long as they don;t rub I don;t care. Usually, disc rubbing is caused by off-centre caliper alignment. On post-mount hydraulics, it's a matter of loosening the mounting bolts, applying the brake, and gently nipping up the bolts without moving the caliper before tightening to the correct torque. Cable discs are a bit more painful to centre. Fortunately, they're a distant memory on my bikes, and my son (who has Avid cable discs) never swaps his wheels.
If it is simply a little bent, that can happen quite easily. A bump against a door, leaving it leaning against something... you can do it without noticing. When they're new and havent been through many heat cycles, the act of hard braking and getting them hot and a sudden cool-down from a creek crossing can do it too.
The good news is it's easy to fix. Youtube has numerous help videos on the subject. You just need a small shifting spanner clamped down over either side of the brake track, and gently but firmly bend the rotor to the side. Don;t use pliers - the serrations in the jaws will mark up your brake track and make your brakes feel horrible to use.
My discs are rarely perfectly true. So long as they don;t rub I don;t care. Usually, disc rubbing is caused by off-centre caliper alignment. On post-mount hydraulics, it's a matter of loosening the mounting bolts, applying the brake, and gently nipping up the bolts without moving the caliper before tightening to the correct torque. Cable discs are a bit more painful to centre. Fortunately, they're a distant memory on my bikes, and my son (who has Avid cable discs) never swaps his wheels.
- Cinder
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Re: Disc Brake Maintenance
Postby Cinder » Wed May 26, 2010 8:38 pm
Yeah, pliers probably aren't a good idea, not straight onto the disc anyway.
Given the age of the bike, go ask the guys that sold it to you...
My Hayes had a brief period of annoyance when they were new but after a bit of use and abuse they wore them selves in (or is that out).
Given the age of the bike, go ask the guys that sold it to you...
My Hayes had a brief period of annoyance when they were new but after a bit of use and abuse they wore them selves in (or is that out).
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