[LONGHAIR]

I am not a believer in the clamping thing either. Just don't push the pedal far enough to "pop" it. You can feel it stop, but there is more travel beyond that point...just don't do it. You will feel the click and the "Brake" light will come on.
If it does happen, all you have to do is close the bleeder that was open when it happened and open one on the opposite end of the truck, push the pedal to the floor and it should pop back.

If not, close all bleeders and "snap" the pedal hard/quick. This will jolt the pressure and balance it back out.

Personally I am more of a fan of gravity bleeding. Open all of the bleederes at one time, never touch the pedal. Let them all run/flow for a while. This "flushes" out some of the old fluid, wheich is a good thing anyway. Just be aware of the master cylinder while this is happening. You cannot let it run dry, just keep toppoin it up as it flows. After you have run some new fluid in for a while, go back and close the bleeders.....never touching the pedal until they are all closed.