Thank for the good info 3B. I noticed that the master cylinder I got (the 76 T-bird one) was also used in some cars with disk/drum setups. Does that mean it has a residual pressure valve build in (because it supports drums), or would that have been build into the combination valve?

52 suburban rat rod. 350/350, 9-inch ford rear, independent suspension with 2-inch drop spindles, power rack, two-tone Mexican blanket interior, paint by mother nature