It is my 1995 Mazda Capella (The same as 626). The brake fluid pressure at rear left brake caliper does not release immediately every time I release the brake pedal. The pressure holds for 1 or two seconds more (the brake drags the disc) and then release slowly after the car starts to move. It holds if I do not move the wheel. What is wrong? Is it the ABS hydraulic pump, the ABS control module, the wiring or anything else?