In a message dated 11/1/04 1:34:41 PM, wetwesty@TACTICAL-BUS.INFO writes:

<< I have noted a variance In pedal movement that I have tracked to amount of

vacuum in the system. >>

Better stay on the trail because, considering the functioning and
construction of a vacuum brake booster, it is impossible for a vacuum leak to change the
amount of brake pedal movement.  A vacuum leak might cause the perception of
the amount of movement to seem different, but that is all it will change.

Whenever this subject was broached, I suggested that the problem might be
caused by an internal leak in the master cylinder.  Apparently some thought that
an internal leak meant a leakage into the vacuum brake booster.  A leak into
the brake booster is an external leak, for it is external to the master
cylinder.  An internal leak in a master cylinder is leakage around the piston cups
into the fluid reservoir.  If an internal leak in a master cylinder is severe
enough, it can readily be detected by watching the surface of the fluid in the
reservoir while depressing the brake pedal fast and hard.  The pulse of leaking
fluid will appear as an eddy (for want of a better word) on the surface of
the reservoir fluid as the leaking piston cup burps.

George