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My hydraulic MTB brakes stated to squeal after I washed my bike why?

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What did you use to clean it? Some cleaning solutions can leave a residue that can cause disc brakes to squeal. – jimirings Feb 27 '13 at 18:14
The disk brakes on my 2001 Honda would squeak badly after a rain. Oxide builds up on the disks and must be rubbed off to eliminate the squeaks. – Daniel R Hicks Feb 28 '13 at 0:00

Did you re-lube your chain after you cleaned the bike? If I am not careful when I lube the chain on my mountainbike I get some splatter and if it gets on the brake pads I get loud braking for a while, louder when wet.

Now, I slowly lube my chain while turning cranks backwards, key is slowly, both to get every linkage and not splatter lube. Then I continue to spin backwards slowly for 30-40 seconds, let is set for 5 minutes and use a rag to wipe any excess from the chain so it doesn't splatter once I get going.

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A clean rag and some brake cleaner or alcohol after cleaning can help too. – alex Feb 28 '13 at 1:08

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