I just installed new Sram Rival group. The rear brakes are making an awful noise, more than just squealing. I have Shimano wheels that are less than 1 year old. I cleaned the wheels. Also, replaced the new Sram pads with my previous pads which are less than 6 months old and still in good shape. Nothing seems to help. I noticed the left pad is barely on the rim but is making full contact with the rim. The right pad is perfect. Almost as if the left arm is shorter than the right. Any suggestions?
You might also check that there's no play in the calipers as this could lead to them vibrating. But even if you do everything you can, you might find that you just have a rim-block-frame combination that just doesn't want to shut up. You may also find that they bed in after a while and sort themselves out. Good luck.
Thanks. You may be right it does sound and feel more like vibration than scrubbing like on pad and rim. Do you mean play in the anchor bolt and frame connection or the pivot bolt. Any other remedies to the vibration?
Any play at any point could allow the brake assembly to resonate/vibrate, so try and eliminate it wherever possible. However, it could just be that the combination of your seat stay length, calipers and blocks are prone to resonating.
I have a problem with the rear disc brake on my hard tail MTB, it sends a "buzz" through the frame. I have re-aligned the caliper and it has cured it to some extent, but it still does it on occasion.
Still no luck. Everything is tight. It is definitely a vibration that resonates up the seat stays. I removed the caliper and reinstalled. The front caliper works no problems.
It is definitely not something I can live with. Any other thoughts? Thanks.
Have you tried re-facing the brake pads? To be honest, I'm clutching at straws, but it might be worth a go. Remove the brake pads, place a bit of course sandpaper on a flat surface and rub the face of the brake blocks on the sandpaper until you get a flat, even new face.
Even if this does work, you may find that the noise returns once the blocks have developed a new "sheen" from the rims.
Thanks for all your suggestions. I went to my LBS and they pointed out that the reach on the Rival calibers was too short. The pads were not hitting the rim correctly, which I did notice initially but thought I would get around. The pads were right on the edge of the rim creating the vibration. I put my old caliper back on and it is working perfectly. So I'm left with the old brakes but a great new drive train. So I'm happy, for the most part.
I have to say that this website is pretty awesome; getting advise from half a world away is amazing. Thanks again.
I'm having a similar issue on my rear brake: FSR Stumpjumper with Juicy 5's. System worked great until I went riding through some nasty sand/silt. It vibrates/resonates/sounds horrible ever since. All components seem to be tight and I've tried replacing the brake pads.
Any ideas how I might fix or at least isolate the problem?
Tried to re-align the caliper as you described... a few times... but I notice no difference. Any other ideas?
Thanks