ok, I am in a similar situation, have a 9/72 40, the entire braking system is swaped out with a 76 front and Downey rear disk kit, the master cylinder has the side outlet, took off the cap and found no residual valve in either outlet. There was a T inline item, for the front brake line, I think it was a residual valve, it has been removed but i have found nothing in the rear lines or outlet
ideas??? or is there no residual for the rear brakes
ideas??? or is there no residual for the rear brakes