Thanks. I have a 70 Mustang disk/drum master cylinder (has built it residual valves) in my '52 GMC. I can't find a Orion Motor Tech bleeder for my master cylinder, but just sent their tech support group an email. We'll see.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.