Hello PDM,Hello, this is my first discussion. I have previously posted on discussion "1968 Galaxie XL Power Brake Booster and Master Cylinder."
I have a 1968 Ford Galaxie XL convertible with front disc brakes and have a brake issue. I have restored the power booster, rebuilt the pressure differential and control valve, bought new proportioning valve, and no leaks in lines... but still has a low brake. any suggestions would be much appreciated...Mechanic is at a lose.
Your situation could be as simple as 1.) push rod in the booster to master piston needs adjustment and or 2.) Your master is missing or has a defunct residual pressure valve.
It also could be the rear shoes aren't adjusted, or you have a mismatch of parts if the booster has been replaced with another kind.
I recently did a large writeup on the entire brake system overhaul in my '68 XL. I cover these topics and more if you're interested here 1968 Disc Brake System Overhaul