freightliner BUSINESS CLASS M2 100, Maintenance Manual

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Check the plunger for signs of wear or cracks.
Replace it if necessary.
9. Lubricate the plunger with barium grease (BW
246671).
10. Insert the plunger in the valve.
11. Install the brake pedal with the pivot pin.
12. Install a new roll pin and apply Torque Seal
(OPG F900 White) to the roll pin.
13. Install the brake valve assembly; see Group 42 ,
of the vehicle Workshop Manual.
14. Test the brakes before returning the vehicle to
service.
42–13 Brake Inspection
Parking Brake Operational Check
IMPORTANT: This procedure should be per-
formed prior to lubrication of the brake compo-
nents.
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 vehicle 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 vehicle workshop
manual for repair procedures.
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. If the tool is needed, use tool DDC
DSNCHA018005 only and no other tools. See
Fig. 11 . If the tool is needed, see Table 3 for
torque specifications for a 47 in (119 cm) long
wrench.
f422665 10/02/2018
1 2 4 5
3 6
Fig. 10, Axial Bolt Tightening Pattern
Brakes
42
Business Class M2 Maintenance Manual, November 2019
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