Hitachi ZW 310-6 Operator's Manual page 276

Procedures
d
WARNING:
 Once the parking brake is released, the machine
becomes impossible to stop with the parking
brake system.
 Chock all tires to prevent the machine from
moving.
 Before restarting to operate the machine, consult
your nearest authorized dealer to have the
parking brake adjusted.
1. Rotate bolts (1, 6) counterclockwise and remove the
parking brake cap.
2. Remove lock plates (2, 5) from set bolts (3, 4).
3. Press in bolts (3, 4) until they reach the screwed part
of piston (7).
4. Tighten bolts (3)(4) alternatively and evenly until the
brake discs become free by removing piston (7) apart
from the brake discs.
TRANSPORTING
6-8
90Z7-6-8-1JPUS
90Z7-6-8-2JPUS