I have upgraded brakes on two trucks with the master under the floor. A 52 3800, and a 61 ford 350. Both trucks now have disc brakes at all 4 wheels, and both trucks have a pair of 2 lb residual pressure valves.
For the brake line to go to the right front, I ran mine along and on the back side of the transmission crossmember, as the original was.
Both front lines come from their own places on the proportioning valve, so no T-fittings needed.
The proportioning valve has only one line going to the rear, then it branches off just after the flex line to the housing.
Grigg
