I'd suggest the problem may be in the "upgrades" done, the modern MC and power booster and the residual valves
thinking the same thing... Residual valves.
I'm in the middle of the same upgrade- all new everything, and switching over to dual pot MC (manual, no booster)
I did all the reading on the valves, and can't figure out why they are required... For drum brakes.
I understand that for DISK brake conversions with the MC down low, you need them- however for Drum brakes, it seems you need them for a different reason- keeping the shoes against the drum... which they would need regardless of the placement of the MC-
So by that rationale- if the MC donor vehicle used drum brakes, unless it had external residual valves, it should be part of the MC... At least thats my thought process. S
I have a dual pot manual MC for a 67+ chevy truck. Anyway, hopefully my setup will work without adding extra valves.
I should have it bled and working in a week- i'll let you know if it turns out i needed the extra valves or not!
