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Hello, I have a Trek 4900 with mechanical disc brakes. Ive had them for around two months now. since the last week, whenever I apply the brakes, they make a squealing noise- yes both of them. Is this normal? I dont have a drop in stopping power- they are just as strong as they were when I got them. Its just the noise thats annoying me- nothing else. I just want to make sure that there isnt a problem with my brakes. Can anyone help me out?
 

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Clean the rotors with isopropyl alcohol and keep your fingers (and oil) away from them.

gently sand your brake pads using a very fine grit sand paper.

stop nice and easy for 10-20 stops. are they any better?
 
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