Operation and maintenance manual

Section 170-0010
5
SM 2253 10-03
* * * *
Parking Brake - Parking Brake and Mounting
7. Remount actuator (9) on cap assembly (22, Fig. 2)
and install washers (11) and nuts (10). Tighten nuts
(10) finger tight only at this stage.
WARNING
Do not pressurize actuator until the following
instruction has been carried out. Pressurizing
the actuator beforehand can result in serious
brake damage.
8. Turn adjustment screw (14) on the slack adjuster (3)
in a clockwise direction until the brake pads in calliper
head assembly (2) are tight against the brake disc.
9. Connect hydraulic line to actuator (9). Place the
battery master switch in the 'On' position, start the
engine and pull out parking brake control knob to
extend the actuator.
10. Connect slack adjuster (3) to actuator (9) by
inserting clevis pin (7) through clevis (10, Fig. 2) on
actuator (9). Secure clevis pin (7) with cotter pin (8).
11. Align actuator (9) to slack adjuster (3) and torque
nuts (10) to 115 - 136 Nm (85 - 100 lbf ft).
12. Loosen bolt (15) at the control arm of slack adjuster
(3) and control strap (12).
13. Position control arm of slack adjuster (3) in fully
released position (forcing it in a direction away from
actuator (9)) by turning adjustment screw (14) on the
slack adjuster (3), until it comes to a positive stop
inside the control strap (12).
14. Tighten bolt (15) at the control arm of slack
adjuster (3) and control strap (12).
Note: Failure to position the slack adjuster against the
internal stop may result in brake drag.
15. Use 1.5mm feeler gauge between brake pads in
calliper head assembly (2) and brake disc. Turn the
adjustment screw (14) on the slack adjuster (3) until
the 1.5 mm total clearance is obtained.
16. Remove feeler gauge and apply brake several
times. The automatic slack adjuster will adjust the
brake pad clearance with each application, which can
be seen by the rotation of the adjustment screw (14).
17. When the adjustment screw (14) stops rotating, the
specified clearance of 0.7 - 1.0 mm has been obtained
and the brake is ready for normal operation.
18. Remove wheel blocks and place the steering lock
bar in the 'Stowed' position.
MAINTENANCE
Every 250 hours
Check wear on brake pads and disc. Replace brake
pads when lining thickness is 3.0 mm (0.125 in) or
less.
Brake Pad Replacement
1. Remove calliper head assembly as described under
removal.
2. Replace worn brake pad and carrier assemblies.
3. Install calliper head assembly and adjust slack
adjuster as described in installation.
SPECIAL TOOLS
There are no special tools required for procedures
outlined in this section. Refer to Section 300-0070,
SERVICE TOOLS, for part numbers of general service
tools required. These tools are available from your
dealer.
SPECIAL TORQUE SPECIFICATIONS
TORQUE
FIG. NO. ITEM NO. ITEM NAME Nm lbf ft
1 6 Nut 745 550
1 10 Nut 115 - 136 85 - 100
2 2 Bolt 170 - 183 125 - 135
3 4 Bolt 680 490