Ducati Scrambler Owner's Manual page 128

Rear brake pedal
Loosen counter nut (4).
Turn pedal stroke adjusting screw (5) until pedal is in
the desired position. Tighten the counter nut (4).
Operate the pedal by hand to check that there is
about 0.06-0.08 in (1.5-2 mm) of free play before the
brake bites. If not, adjust the length of the master
cylinder pushrod as follows.
Loosen lock nut (6) on master cylinder rod.
Tighten rod (7) on fork (8) to increase clearance or
loosen it to decrease it.
Tighten lock nut (6) and check again clearance.
126
6
7
8
5 4
Fig 78