brake noise on disc brakes could just be the disc.

fooferdoggie

Well-Known Member
OK here is my experiment. my main bike has Magura MT4e e bike brakes with 180 mm rotors. these are very powerful brakes so this may make a difference.


also between brake pad and or disc changes I sanded the pads and disc and cleaned with alcohol and then broke them in with the 20 or so almost stops that are recommended. I also re aligned the calipers between disc changes.



ok my brakes did not make noise for a few weeks and only started when we had heavy rain so they were wet. both front and back squealed when wet. no noise but a ticking the front rotor that has happened on three different rotors. well after several rain rides the back stopped squealing or very little for a short time but the front always did. when I took the bike in for the first tuneup they sanded it all and it was the same squeal when wet but just the front. when I wore out the first pads after about 1600 miles I used the harder pads not the sinterd ones they came with. a little noisy but no biggie. well it rained on the next ride and man the front really squealed but it also had a warble to it. the back was fine a little squeal at first then gone.



well I sanded the disc and put the sintered pads back on the front the squeal was less like normal but the warble was still there but not as loud.



I bought a normal shimano disc and it was a bit warped out of the box. but it only squealed a little in the rain and it would go away. but it would warp randomly in harder braking but it would straighten out on its own. so I bought another magura disc that was the same as the one I have. it only had a light squeal once while raining and that's it.



so disc noise may just be the disc if you have tried everything else. that includes cleaning and sanding the disc and pad realigning the calipers.
 

jaizon

Active Member
I would think that if what you are saying is the case...you'd see a lot more comments about it on EBR. 🤔
 

Sierratim

Well-Known Member
OK here is my experiment. my main bike has Magura MT4e e bike brakes with 180 mm rotors. these are very powerful brakes so this may make a difference.


also between brake pad and or disc changes I sanded the pads and disc and cleaned with alcohol and then broke them in with the 20 or so almost stops that are recommended. I also re aligned the calipers between disc changes.



ok my brakes did not make noise for a few weeks and only started when we had heavy rain so they were wet. both front and back squealed when wet. no noise but a ticking the front rotor that has happened on three different rotors. well after several rain rides the back stopped squealing or very little for a short time but the front always did. when I took the bike in for the first tuneup they sanded it all and it was the same squeal when wet but just the front. when I wore out the first pads after about 1600 miles I used the harder pads not the sinterd ones they came with. a little noisy but no biggie. well it rained on the next ride and man the front really squealed but it also had a warble to it. the back was fine a little squeal at first then gone.



well I sanded the disc and put the sintered pads back on the front the squeal was less like normal but the warble was still there but not as loud.



I bought a normal shimano disc and it was a bit warped out of the box. but it only squealed a little in the rain and it would go away. but it would warp randomly in harder braking but it would straighten out on its own. so I bought another magura disc that was the same as the one I have. it only had a light squeal once while raining and that's it.



so disc noise may just be the disc if you have tried everything else. that includes cleaning and sanding the disc and pad realigning the calipers.
I had a similar experience. Tired everything, nothing really helped for more than a few miles. Changing out the rotor fixed it.