|
MountainBikeReview.com's Forum Archives - Brake Time
|
|
Pinging noise with disc brakes, is this normal (3 posts)
|  Pinging noise with disc brakes, is this normal | Kramer
Sep 23, 2001 12:38 AM | | Hi I have Avid mechanical disc brakes, is it normal to hear a pinging sound coming from the front disc brake.
It appears the sounds is coming from the metal rotator at times,the brake pads don't appear to be rubbing.
How do you fix this vibration ??
Also the front disc brake appears to make another vibration sound, while pedaling along.
Is this normal for disc brakes to do this.
How do you fix it.
Cheers Kramer |
| disk pinging | melanthius
Sep 23, 2001 6:50 AM | | That pinging noise is caused by the trailing edge of the pad hitting one of the vent holes in the rotor. This is indicative of a few possible problems: you could have an out-of true rotor, you could have a loose pad magnet, or you could have an incorrectly set up brake.
Check rotor trueness by spinning the wheel and carefully watching the rotor. If it moves side to side or up and down during the revolution, loosen all the T25 (Torx head) rotor mounting bolts and reposition the rotor on the hub. There is usually a small amount of play around the bolts, and this can be the source of a "hop" in the rotor. So, center the rotor and retoque the bolts to 55in.lbs. Use a torque wrench, as uneven torque here can cause the disc to wobble out of true. If this doesn't help, Avid will give you a new rotor if you ask, but I would recommend taking the bike to a reputable shop and having the brake set up professionally before you do that, we shop geeks often make things work very well (and have torque wrenches).
Check to see if you have a loose pad magnet by removing the wheel from the bike an *gently* trying to move the pads, one at a time, towards the center of the caliper. If the magnet comes with the pad, you'll have to reglue it with super glue. It is a very simple procedure and Shiggy posted the exact steps here a couple days ago.
After remounting the rotor, try setting up the CPS system again. Follow the instructions carefully, making sure you tighen bolts in the right order. Remember that you can adjust pad to disc distance with the speed dial knobs. Again, take it to a good LBS before you complain about defective product.
Finally, remember that forks and rear suspension frames can be flexy, and under forceful riding conditions you might hear the pads hitting the rotors. This is normal and is either a fact of life for lightweight gear, or an indication that you might want a more substantial bike.
-Mel NADS#2pi |
| spoke movement | TC
Sep 25, 2001 1:31 PM | | I had pinging noises for a while but this went away after having the wheel trued and tensioned properly. just a thought. |
| |
|
|
