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Squealing From Shimano Disk brake

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Squealing From Shimano Disk brake

Old 08-10-23, 09:45 AM
  #26  
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But the big news is I think I may have solved the problem. Today after my ride which included the noisy brakes, I removed the pads and did a very deep sanding of the pads with 220 grit. I notice the pads seemed to be a bit glazed over and shiny if that is what is meant by contamination/glaze. I figure at this point no worry on if I sand too much. As it turns out the sandpaper really does not noticeably take a lot of material off the pad, but I went at it very vigorously. I could see lots of black stuff on the light sandpaper. Not sure if it was the pad material so much as maybe the layer of glazed stuff. In any case I put the pad back in and worked the brake. Well, there was no noise at all in the basement on the stand spinning the wheel and stopping it and none putting it on the floor and apply brake with force of bike movement forward. Previously even that would cause a howling. So will be interested to see how it goes tomorrow but I think I may have it under control. I did not clean or touch the rotor this time as it look just like the back rotor in terms of markings on the brake track.

Next question is do I have to attempt to re-bed the pad since I did this, my guess is no since rotor already has been used.
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Old 08-10-23, 01:21 PM
  #27  
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Originally Posted by t2p
Iíve seen / had leaking calipers - unfortunately not uncommon

one caliper appeared to be leaking during the cold winter months - could see slight oil residue on the back part of the pads - but it appeared to improve / go away (for the most part ?) during the warmer summer months

bike often sits in an unheated garage where temps can often be below freezing during coldest part of winter

after rides through a lot of crap I will often will pull the pads and clean the inside of the caliper and surrounding area and check the back of the pads ... q tips work great for this
Unfortunately, my caliper was leaking in the hot, humid Summer months!
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Old 08-10-23, 02:10 PM
  #28  
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Originally Posted by oldwinger14
Unfortunately, my caliper was leaking in the hot, humid Summer months!
next time consider investing in the self-repairing fault-tolerant calipers - example : BR-RS785-SRFT caliper

and self-straightening fault-tolerant rotors - example : SM-RT86-SSFT
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Old 08-10-23, 02:39 PM
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Originally Posted by t2p
next time consider investing in the self-repairing fault-tolerant calipers - example : BR-RS785-SRFT caliper

and self-straightening fault-tolerant rotors - example : SM-RT86-SSFT
Thanks . I may follow up with it if Shimano does not give me a new caliper as a warranty replacement
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