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Shannon it seems that you have done a great effort in making your 914's braking system up to date.
First for the grinding of the front 320i calipers. Assure that the surface of the mounting flange has been milled 0.125" to allow center of rotor to center of caliper alignment. Since you replaced the rotors, you have both alignments to assure.
As DD has said, the proportioning valve can accumulate and retain air. Because of its flat location, removal of the air is problematic. A few other suggestions for bleeding the brake lines.
To make the bleeding process less messy, I found a simple device at my local auto parts store. It is simply a small containment bottle with an attached flexible tubing to connect to the bleeding nipple to contain the bleed fluid.
Using the combined family member/pressure system. This requires understanding by the person compressing the brake pedal that at no time can they lift the pedal while the bleeding nipple is open. Pumping up" the pedal allows a larger volume of brake fluid to be flushed through under hydraulic pressure. It takes time and cooperation.
Follow the bleeding sequence: right rear, left rear, right front then left front.
Another technique I have used in the past is back bleeding. Using the above containment plastic bottle filled with brake fluid, back flush the proportioning valve from left to right.
Hope this helps.
God's Blessings.
L. McChesney
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