There are two things I have come across in the work shop related to this fault. No1 the pistons in the brake cylinder is gummed up and not letting the brakes release . Have to clean and fit new kits. No 2 the flex brake hose rubber inner passage broke down and acted as non return valve. Had to fit new hose and bleed out air.
Hhve you taken it apart yet?? the sliders may be frozen
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