Hello everyone. After 4 years since teardown my 68 M715 is coming back together with a 350 horse 350 (on the dyno) adapted to the stock drivetrain.
The body is back original color with only one rust spot on the floorboard needing fixed. The bed floor was replaced with plate on a new frame due to 30 years as a brush fire truck with a leaky tank.
It is getting a hydroboost power steering/power brake system out of a 1978 K30 chevy. I have the booster mounted to the firewall with the modified pushrod (shortened, welded with additional reinforcing collar), and have confirmed full stroke. I had purchased a new master cylinder which I have installed on the booster.
In searching threads it seems some have just ran lines to the front and to the rear with no residual valves or brake proportioner (with stock axles for now). It seems with that larger front disc cylinder I will have some pretty big front brake bias. I have previously replaced the stock wheel cylinders with ones from Vintage PowerWagon, not sure if they were stockers or the Ford van cylinders. She stopped great before teardown with the stock system.
1) It seems that a manual proportioner valve in line would let me fix bias problems easily once I get it going. What are other's experiences?
2) Any need for residual valves with this type of master cylinder to prevent air being pulled back in the wheel cylinders, or do these wheel cylinders have the proper seals to prevent this?
Thanks in advance for sharing experiences. Next, I do the hydraulic clutch master cylinder!! (System is from a 1987 half ton chevy with hydraulic clutch).
Mike