I recently did this conversion on a 96 GSR... after putting the rs proportioning valve, master cylinder, and front lines but kept the stock GSR BB... after driving the car the brakes will slowly begin to lock up and get to the point where the car wont move... then you can crack the bleeder on any of the 4 calipers and relieve the pressure and itll drive fine until it starts to lock up again. Is there any way the proportioning valve can be getting stuck or keeping pressure on the lines when not under braking? Or could the stock BB be causing it somehow?