I am helping a friend work on his newly purchased 1969 Firebird. The front brakes are pulling. After removing them and seeing new hardware, we drained the fluid and replaced with new fresh fluid. The pulling remains, but strangely in alternating directions. Yep, once to the right and then to the left.

Anyone experience this and have some help?

I thought the "Distribution valve", but know very little about it.
Thanks, Chad