View Full Version : Disc brake squeak?
NHAero
10-28-2017, 11:49 AM
My Anderson bike, with TRP Hylex hydraulic disc brakes, squeaks - only sometimes. It's definitely wheel rotation related, because it happens whether I'm pedaling or not. Sometimes it doesn't happen for an entire ride.
Hints to look at???
Thanks
You can try different rotors or pads. Roughening or cleaning rotors is usually a very temporary fix.
I have changed a couple of mechanical calipers to inexpensive Shimano in order to get rid of noises, which always seems to work.
jtakeda
10-28-2017, 03:03 PM
Pad/rotor contamination is my bet
Spray the rotors down with 70 or 90% alcohol. Shimano Icetech rotors tend to be truer with less squeal IME. Check pad/rotor alignment.
Charles M
10-28-2017, 11:01 PM
Wait, do you mean while riding and not applying the brakes, or do you mean when applying the brakes...?
sales guy
10-28-2017, 11:09 PM
could be bolts need tightened.
could be a bit of frame flex
i actually had someone who had a cracked frame and thats how we found it. Brake noise.
davidb
10-29-2017, 11:34 AM
Face the mounts, if you can or have access to the tools. I have many come across my stand. This is all to often the only things that quiets the noise.
Park DT 5.2 disc brake mount facing set
guyintense
10-29-2017, 11:53 AM
Or you can try what the Hope rep suggested to me. Spray the rotor with water, throw some dirt on it and ride.
El Chaba
10-29-2017, 12:11 PM
Replace with rim brakes?
NHAero
10-30-2017, 01:35 PM
While riding and not applying the brakes.
Mounts have been faced and I will recheck all the bolts but they were set with a torque wrench.
Wait, do you mean while riding and not applying the brakes, or do you mean when applying the brakes...?
jfranci3
10-30-2017, 01:51 PM
yeah, dump some iso alcohol (http://amzn.to/2gOpoYf)on them. If that doesn't work, bake the pads and rotors in the over. Or both.
simplemind
10-30-2017, 01:57 PM
Just a few questions: If they squeak when not applying brakes, then you obviously have pad contact. While spinning the wheel, look down through the pads and rotor and tell me what you see!
Are the pads close to one side? Is the rotor true? Did you center the pads correctly before torquing?
NHAero
10-30-2017, 03:23 PM
I'll look, thanks. Spinning the wheel off the ground I don't hear any rubbing, and they didn't squeak until recently.
Just a few questions: If they squeak when not applying brakes, then you obviously have pad contact. While spinning the wheel, look down through the pads and rotor and tell me what you see!
Are the pads close to one side? Is the rotor true? Did you center the pads correctly before torquing?
Jaybee
10-30-2017, 03:34 PM
Is this under high torque efforts? I've got a disc bike that rubs on the front only when out of the saddle and torquing on the bars side to side. Some flex in the wheels is what I think
my problem is.
simplemind
10-30-2017, 04:30 PM
Is this under high torque efforts? I've got a disc bike that rubs on the front only when out of the saddle and torquing on the bars side to side. Some flex in the wheels is what I think
my problem is.
Could be, are you running qr skewers? I have both qr and 15 X 100 ta (on different (carbon) bikes, and I don't have that issue on either. Also might check the tightness.
Charles M
10-30-2017, 07:31 PM
Step one is proper alignment / setup.
The brakes should have no rub at all and your rotors may need to be trued (or may be warped beyond reason).
They certainly need to be fixed if it's an actual squeak/squeal.
A brake truing tool is cheap and you can true rotors with practice.
I would pull the whole rotor and lay if flat and see if it's too far gone.
I would then put the rotor and wheel back in and apply the brakes and then (with brakes applied) Loosen the Caliper bolts so that there is obvious caliper release. Keep the brakes applied so that the Caliper sets up in line with the rotor. Then with the brakes still tight, tighten the bolts again. The Caliper should have re-seated itself in line with the rotor
If there's still rub and the rotors laid fairly flat on the table, I would go ahead and hit a shop and have them walk through the fix with you.
vBulletin® v3.8.7, Copyright ©2000-2024, vBulletin Solutions, Inc.