November 27, 200520 yr Had my back brake lock up on me twice recently, the first time after taking wheel and pads off and trying to push the pistons back to no avail (all with a large adjustable spanner at the side of the road when plotting the road trial route) it was finally fixed by releasing some fluid from the bleed nipple, brakes were fine for the rest of the day. Put the fault down to overfilling the reservoir. It did it again today back brake locked solid, release tiny bit of fluid ran fine for rest of the day cant be to much fluid in the system as its only half full.
November 27, 200520 yr The usual problem is the master cylinder is not returning to fully closed, have you adjusted the brake lever, as not to have any free play. Any access fluid, caused through expansion, must be able to return to its resevior.
November 28, 200520 yr Author Thanks Lads will check the amount of play in pedal and then try the back bleeding.
November 28, 200520 yr Happened to me, I slackened off the brake pedal and changed the pads, also sparyed some wd40 on the pistons to stop them sticking!
November 29, 200520 yr The brake lever adjustment is very important. If it's set so there's very little movement at the pedal then when the rear brake heats up after riding for a while the fluid expands and locks the pedal up.Somewhere on the internet there must be some technical details regarding brake lever travel for specific bikes.
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