. If your going 4 wheel disc, you can buy a GM 4 wheel disc combination valve, and would need a residual pressure check valve going to the rear wheels. This residual pressure check valve is unneeded if going w rear drums
Isnt that reversed? Disc dont use a rasidual check valve but drums do to compansate for the drum springs.
Am i missing something? I did a 4 wheel disc conversion back in the late 80s on a 56 F100 and all research then called for removing the risidual check valve from the forward cir of the master cyl (ie former rear drum)