get under the dash with the car off. pump the break pedal and see the rod that goes into the firewall (the MC rod). i turned the nut until the break pedal sat HIGHER and not lower.
and the master cylinder is the metal tube that the break fluid resivoir connects to.
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i just put in a new 15/16ths MC the other day.
found out the old one had a piston issue and was leaky.
big improvement.. pedal is stiffer.
try that first..and check your booster.
and the master cylinder is the metal tube that the break fluid resivoir connects to.