HI,

seems like faulty master cylinder was it new, or second hand,you can adjust the pedal travel but go gently by taking the master cylinder away from the servo
unit leave brake pipes on u should have enouth room, you will see the pushrod
coming out of the servo unit with a dome end hold the 1 part and adjust a few
turns at a time, and try,mark it before u start so you can go back if you like,
if u over do it the brakes will bind on , i am assuming you are using s1 master
cylinder, the servo, and air in system you have already covered so providing
theres's plenty of meat on the pads front and rear, its master cylinder,
plus are the brake discs alround in good condition.
Dave,