69 Chevelle SS front brake bleeding

[Lynn]

I have no personal experience with White Post, but have heard nothing but good things about them.

Hard to diagnose without being there, but my first thought was the a residual pressure valve was installed under the brass fitting on the disc brake port on the master.

The first thing I would check though (because it is easier) would be to make certain there is sufficient free play at the pedal, AND make certain the pin between the booster and the master is not too long. If it is just 1/8 inch too long, it is pre-loading the master.

You can check both of those without breaking into the hydraulics.