I've developed this braking problem on my 85 runner. When I first built the rig it was a bone stock automatic then I converted it to manual. I upgraded to the larger brake master cylinder about a year ago and it has been pretty good. Lately the front brakes have been engaging automatically causing them to drag which is a serious power loss. I talked to dave a marlin and he consulted with Marlin about this, and suggested that my pedal didn't have enough free pedal which caused the return for the brakes to be partially blocked not allowing the pressurized fluid to escape once pressurized. I backed the pedal off a little and now the brakes are very weak, so weak that I don't feel comfortable driving it over about 25mph. I still have stock front and rear brakes which might not be very compatable with the new master cylinder. If anyone could give some more advice on my brakes I would be very appreciative.