Disc brakes: rotor rubbing the break pads, making sound?
04-30-10, 11:58 PM
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Disc brakes: rotor rubbing the break pads, making sound?
Hi guys,
Newbie to this forum, and only really getting myself into the world of bicycles (as in, trying to learn the parts, tune-ups myself, what have you). Anyways, I just recently got a new bike that I had to assemble myself, and it came with disc brakes for the front wheel. I assembled it, but when I spin the front wheel, the rotor rubs against one of the disc brake pads. I've looked online, and followed every suggestion I could find, including adjusting calipers, everything, the wheel, everything, but it still rubs, and I hear the sound when it spins. A) Is this normal?
When I take the break pads out, I also notice that both are of different thickness, meaning that the disc rotor is not centred in the gap between the brake pads. I tried adjusting for this using the caliper, but I can't, it's still not centred. B) Are break pads supposed to be of different thickness?
Lastly, I have Promax disc brakes. I don't know the exact "model" or "specifications", but can you tell me if Promax is generally a "quality" brand or not? Or should I aim for something better, like Shimano?
Thank you so much, and thanks for your patience! I've learned so much from this forum already!
Newbie to this forum, and only really getting myself into the world of bicycles (as in, trying to learn the parts, tune-ups myself, what have you). Anyways, I just recently got a new bike that I had to assemble myself, and it came with disc brakes for the front wheel. I assembled it, but when I spin the front wheel, the rotor rubs against one of the disc brake pads. I've looked online, and followed every suggestion I could find, including adjusting calipers, everything, the wheel, everything, but it still rubs, and I hear the sound when it spins. A) Is this normal?
When I take the break pads out, I also notice that both are of different thickness, meaning that the disc rotor is not centred in the gap between the brake pads. I tried adjusting for this using the caliper, but I can't, it's still not centred. B) Are break pads supposed to be of different thickness?
Lastly, I have Promax disc brakes. I don't know the exact "model" or "specifications", but can you tell me if Promax is generally a "quality" brand or not? Or should I aim for something better, like Shimano?
Thank you so much, and thanks for your patience! I've learned so much from this forum already!
05-01-10, 09:47 AM
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first off Promax is not a "quality" brand, you should save up and buy something that will work floorlessly, namely a cable disk brake by someone like: Hayes, Clarkes, Shimano, Avid or even Tektro.
on the promax brake you have [forgive any errors, its been a long time since i've worked on them] the outside and inside pad will be different thicknesses.
when you take out the pads does the disk still make the rubbing sound? if so it might be rubbing on the top of the caliper.
if you have a small red dial on the side of the brake [some promax brakes have this] use this to center the caliper.
is the 'arm' of the brake caliper to high? this will course the pad to be to close to the rotor it needs to sit at around 45 degrees for best brake performance
when you look down from the top onto the caliper are both pads and rotor all parallel together? if not you will need to get the fork mounts 'faced'
hope this helps in some way :-)
on the promax brake you have [forgive any errors, its been a long time since i've worked on them] the outside and inside pad will be different thicknesses.
when you take out the pads does the disk still make the rubbing sound? if so it might be rubbing on the top of the caliper.
if you have a small red dial on the side of the brake [some promax brakes have this] use this to center the caliper.
is the 'arm' of the brake caliper to high? this will course the pad to be to close to the rotor it needs to sit at around 45 degrees for best brake performance
when you look down from the top onto the caliper are both pads and rotor all parallel together? if not you will need to get the fork mounts 'faced'
hope this helps in some way :-)
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