Thomas SAF-T-LINER C2, Maintenance Manual

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16. To exit maintenance mode, perform the following
steps.
16.1 Perform the same steps used for entering
maintenance mode.
16.2 Using the battery disconnect switch, cycle
the DECU battery power off, then back
on.
Parking Brake Operational Check
CAUTION
Perform the following check in a clear safe area. If
the parking brakes fail to hold the vehicle, per-
sonal injury or property damage may result.
1. With the engine running, and air pressure at cut-
out pressure, set the parking brake.
2. Put the vehicle in the lowest gear and gently at-
tempt to move it forward. The vehicle should not
move. If the vehicle moves, the parking brakes
are not operating correctly and must be repaired
before the vehicle is returned to service. See
Group 42 of the Saf-T-Liner C2 School Bus
Workshop Manual for repair procedures.
Brake Component Inspection
Air Disc Brakes
IMPORTANT: The following step to inspect the
caliper mounting bolts should only be performed
at the initial maintenance (IM) interval.
Vehicles may have both axial and radial
mounted calipers. Follow the instructions based
on the type of calipers installed on the vehicle.
Axial Mounted Brakes
IMPORTANT: The following information applies
to all types of axial mounted brake applications.
1. Park the vehicle on a level surface, shut down
the engine, and set the parking brake. Chock the
tires.
2. Raise the vehicle and support it on jack stands.
3. Remove all of the wheel assemblies. For instruc-
tions, see
Group 40 of the Saf-T-Liner C2
School Bus Workshop Manual .
NOTE: In all steps that require a torque wrench,
use a Snap On torque wrench ATECH4RS600,
or an equivalent, with a center to handle length
of 47 inches (119 cm).
4. Set a torque wrench to 350 lbf·ft (475 N·m) and
tighten the caliper mounting bolts following the
tightening pattern shown in
Fig. 10 . If they do
not turn, no further work is needed. If they turn,
take the vehicle to an authorized Freightliner
dealer to have all of the caliper bolts on that
wheel end replaced. Due to limited caliper bolt
access, it may be necessary to use tool DDC
DSNCHA018005 referenced in tool letter
18TL18. See
Fig. 11 . If the tool is needed, see
Table 1 for torque specifications for a 47 in (119
cm) long wrench.
f422665 03/26/2020
1 2 4 5
3 6
Fig. 10, Axial Bolt Tightening Pattern
f580518 09/28/2018
Fig. 11, DDC DSNCHA018005 30mm Air Disc Brake
Caliper Brake Bolt Torque Adaptor
Brakes
42
Saf-T-Liner C2 School Bus Maintenance Manual, November 2020
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