[RichardJ]

.>>lock brakes and unbolt the MC from the booster. That unlocks both calipers too.<<

Start by checking free-play on the brake pedal. Use 2 fingers to press down on the pedal for 1/8" to 1/4" of free play.

Measure the distance you have to move the MC flange away from the booster. Add a 1/16" to the distance measured and that is the distance you must shorten the booster pin.

They do have a tool to check the pin clearance.

You can take the measurements with a depth gauge, but you have to be able to move the MC a good distance away from the booster to get in there or remove the brake lines.