I am completing a mini truck disc brake conversion on my ’72 FJ40 and have run into a problem. The problem is in the rear brakes. They don’t lock up :dunno:. I changed the stock MC to a unit out of a ’83 Celica. That car should have had disc front and drum rear. I have a feeling that the problem lies in the lack of a residual valve for the rear. I checked the old Celica MC and could not find any residual valves. Could there have been a valve that was place “inline” to give the rear drums the necessary line pressure? If so, is there a way to put a residual valve “inline” to solve the problem. If all else fails, I can go back to the original MC and just remove the valve out of the front :G. Randy <>< aka. webmaster ‘72 FJ40, stock F engine, LC 4 speed, York, No-Slip(rear), Lock-Right(front), Mini Disc Front, Saginaw P/S.