Question about Mountain 09 Avid Bb7 Mechanical Disc Brake 160mm Bike

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My outerpad of my disk brake rubs against my rotor while riding. Even though I have backed out the dial up knob all the way. My rim wheel sits properly. Not sure what is causing the problem.

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You may have a bent or warped disc. This happens much more easily than one would expect. You will have to remove the disc from the hub and lay it on a perfectly flat surface to see. If it is you can try remounting it and make sure the torx screws are snug. Tighten them the way you would when changing a car tire in an X pattern. Then try gently but firmly bending the disc in the opposite direction in the spot where it is rubbing. Some people have used thin washers behind the disc in the closest mounting hole but I would recommend a new disc.

Posted on Apr 24, 2009

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Have the front wheel bearings checked they are a sealed unit that has to be pressed in or assembly removed and replaced. Or your brakes are dragging and rubbing against the rotor it could be the caliper is sticking or the rotor doesn't have enough wave, warp cut in it to push the pads back enough. Most people think a rotor is cut perfectly flat if this was true the pads would rub against the rotor all the time. The car could be jacked up and on stands and have someone listen for the noise right next to the wheel while you speed up the wheels and slow down with the brakes and don't try for 100mph you could hurt the tires

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I have a 2002 gmc sierra 2 wheel drive and when I take off initially and when I turn left I hear a grinding/grumling noise.


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Ok, on disc brakes, the pads always have slight pressure on the pads. When I say slight, that's exactly what I mean. The pads slight pressure on the rotor is designed to keep the rotor and the pad clean and free of water. Thus good braking in wet conditions. There are no springs or anything to 'pull' the pad back away from the rotor.

Now, as for warpage. Since the disc brake rotor on a motorcycle is a very thin design, a bit of warpage is not uncommon. The only way to accurately check for warpage is to check the rotor with a dial indicator. Your local shop can do this for you but as long as you're not getting a "surging" feeling when you apply the brakes, you're fine.

From what you have described in your post, there's probably nothing wrong with your brakes. If you have any doubt however, you need to have an experienced mechanic check the brakes on your bike. Defective brakes can cause serious injury or death. Do not ride a bike that you are not certain of the servicability of the brakes.

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