| Hi Dave,
My Bro had this problem. He'd readjust the whole system (even replaced the caliper at one point!) and it would lockup again on the next journey.
The solution was to use 'Screw-lock' on the little adjuster screw(4mm?) that's at the brake pedel (I think it switches on the brake light). It was vibrating out by a millimeter or less everytime he applied the brake, and would eventually just lockup the rear wheel.
Good luck.
Jinx.
[Edited on 13-8-2003 by Jinx] | 
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