yz 426 beak locking up/ overheating

I being having problem with my rear break, its get overheated and it will lock, I put the caliper apart clean it and put fresh oil but the problem come back again any one can give me some ideas? Maybe the master cylinder is the problem?

it happened to me once on the front because i tuned it too tight, then i gave a bit of slack to the lever and problem gone, maybe your problem is related (lever tight, pads rubbing, disc bent)

yes what hedpi said - make sure brake pedal returning all the way (must let master cylinder pin return all the way) and if that not the problem then its probably corrosion on the pins causing slight hanging with resultant heat. Also new pads are thicker than old worn ones and that helps too.

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