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Why does disc brakes squeak?

Why does disc brakes squeak?

Squealing brakes are quite common and they are just annoying and irritating. Squealing also indicate poorly set-up brakes. 


1- The rotor or pads are contaminated. 

2- Grease or oil on the brake pad and rotor. 

3- The contact between the braking surfaces is misaligned. 


1- Clean your rotors with a specific (oil-free) disc brake degreaser. An alternative and common remedy is alcohol. Use it to clean the disc rotors with a small rag. Avoid using spray lubes anywhere near a bike with disc brakes. 

2- Clean your pads with sandpaper. If the grease has soaked through the pad, you might need to replace them. Don't use a degreaser or chemicals on brake pads. 

3- The calliper is not lined up with the disc rotor, or the rotor is slightly bend which can be easily straightened with careful use of an adjustable spanner.  

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