i have a 56 pickup with single piston master cylindar. has anyone adapted a double with power assist for drum brakes from a donor vehicle? i hate the thought of spending $400 unless i have too. thank you

 

I've got a 56. When I purchased it, it had power brakes but witht he single piston one chamber master cylinder on it. I'm installing disc brakes on the front, so I replaced the master cylinder with the dual chamber. Not sure what vehicle it came out of, it took a while to figure out the booster is out of a GM vehicle. I purchased the master cylinder out of a dual disc brake corvette and it match right up. They have kits on ebay that are complete you may want to check out. Good luck.