Lever Stroke

Adjust the shoe clearance before adjusting lever stroke. Ref. to SHOE CLEARANCE , ADJUSTMENT, Parking Brake Assembly (Rear Disc Brake).
Remove the parking lever cover.
Operate the parking brake lever 3 to 4 times.
Turn the adjusting nut until the lever stroke is at the specified value.
Lever stroke:

5 to 6 notches when pulled with a force of 200 N (20.4 kgf, 45 lb)

Fig 1: Identifying Adjusting Nut
Courtesy of SUBARU OF AMERICA, INC.
Check there is no brake drag.
Install the parking lever cover.