Quote Originally Posted by rspears View Post
Navy, sitting this morning and your problem popped into my head. I'm wondering if you don't have a bad master cylinder. Looking at the Pete & Jake's catalog they have a MC for "Corvette Dual", and then three models of their GM Generic - 1) disc/disc, 2) disc/drum 7/8", and 3) disc/drum 1" that happens to be the chrome model. I think I'd be tempted to buy one of the GM Generic's for disc/disc and see if that might fix your problem. Also questioning that banjo fitting with the very small port.
I have 2 new ones, 1.125" and a 1", corvette types . I wonder if the out put is different on the Generic type as in equal amt of out put fluid ? The ones I have have a 2 to 1 out put, the 2 going to the front.

With all my testing including the last one with a proportioning valve from the junk yard I believe some how I have to increase the pressure to the rear caliper.