I have a shimano xt br-m775 hydraulic disk brakes for 2 weeks now and i can hear a loud squealing sound at the rear calipers when i press the brake levers. calipers and rotors are aligned, no leaks at the calipers. what will i do to stop the wierd sound?
by 
brt
ANSWERS: 2
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You may have gotten oil, grease, or water on your brake rotor. If it's water simply wiping them off or waiting several minutes should fix it. If it's oil or grease try wiping it off. If that doesn't work try using a degreaser that says it can be used on disk breaks, then wiping the rotor. You can also clean your disks and pads by dampening a clean cloth with rubbing alcahol and wiping down the rotors and pads. Remember not to touch the pads with your fingers.
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If you've gotten any oil on the rotor and the brake shoes. They are done. No amount of degreaser or cleaning will fix that. The brake shoes will soak it up and never work right, along with glazing the rotor when braking with contaminated shoes. That will produce a loud barking type of squeal. Also, the reason to replace the rotor too, is that the metal will also soak up some oil in the pores of the steel. It's not just a solid piece of steel. It has microscopic pores, the oil will get in, and even after a cleaning with a degreaser, it will still have some. Then as soon as you hit the brakes with new shoes. It will start to contaminate again. Now, if the sound you're getting is a high pitched kind of hum and not a loud barking. That's nothing. Some times they do, sometimes they don't. That's just part of disk brakes. Nothing to worry about. Just ride.
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