Finally got around to installing the latest Master Cylinder. I selected a Fenco 10-1331 or M1331 which is specifically for a 3/4 ton pickup. The first two reman master cyclinders did not work correctly. One leaked fluid from the front and the second would not move much fluid even after bench bleeding. Never had any problem with reman stuff before, so was wondering if something else was the problem. The Fenco 10-1331 is working well so far. It still seems to have a little air in the lines, but the brakes are pretty good. Will take it out for a little drive during the next warm day to really check them out.
I think moving to a master cylinder designed for the 3/4 ton truck (1970 Chevy 3/4 ton) I have has helped. The bore on this master cylinder is 1.125 instead of 1.0 inches. The extra bore does definitely move more fluid which is needed for the bigger wheel cylinders on this truck. The rod length from the adapter kit worked well. If it were shortened, it would not activate both chambers of the master cylinder. I have about 1/2 inch pedal play as it is set up now, so think it is about right.
Thanks for all of the suggestions and help!!
