One thing we routinely did when building experimental automotive brake
systems was to test the integrity of the system every time it was put back
together.  This was done by putting both feet on the pedal (engine idling so
maximum force could be applied by the booster) and push as hard as we could.
An average person can put a few hundred pounds of force on the pedal.  I
plan to do the same on the plane.  It might be best to block the pedals to
avoid excessive load on the rudder cables (or maybe we should test those,
too).  Then no matter how much load is applied when moving it will be less
than the pressure to which the system was tested.

Gary Casey