Yes this is a old post and I have a newer valve for a 71 Challenger disk brake car from Bill at fine lines . The newer , redesigned valve works just as original . If you have one of the older MBM valves and your brakes will not release just swap the top piston from your old valve into the newer one. The problem I had with reusing the oem one is that it would not re seal on the new lines causing it to leak from several areas. the oem lines left a small impression in the soft brass seats that caused the leaks even after loosening and retightening the lines several times.