I have been trying to find the reason why the brakes pull severely to the left when applied (66 Corvette). I've had both calipers off, inspected the pads, rotors, bled the brake lines etc. Somebody pointed at a connection point and told me that it was a proportioning v/v. I opened it up to find that it is just a connection point (in line after the master cylinder, one pipe applys pressure to three: rear, front right, front left).

The brakes are being applied on both sides. With the front end up and my wife with her foot on the brake I can't rotate either wheel. This suggests to me that the one side is going on harder than the other. Brake lines look fine to me although its hard to tell with the braided pipes that actually go the last leg to the caliper.

Any advice would be appreciated

thoose calipers have four pistons each its very possible that some could be stuck