freightliner Custom Classic MT45 2022, Maintenance Manual

Page: 96 / 138

5. Install the wheel assemblies. For instructions,
see
Group 40 of the Walk-In Van Chassis Work-
shop Manual .
6. Remove the jack stands and lower the vehicle.
Drum Brakes
1. Park the vehicle on a level surface, set the park-
ing brake, and chock the tires. Once the tires are
chocked, release the parking brake.
WARNING
Manually adjusting an automatic slack adjuster to
bring the pushrod stroke within legal limits is
likely masking a mechanical problem. Adjustment
is not repairing. Before adjusting an automatic
slack adjuster, troubleshoot the foundation brake
system and inspect it for worn or damaged com-
ponents. Improperly maintaining the vehicle brak-
ing system may lead to brake failure, resulting in
property damage, personal injury, or death.
2. With the engine off, and 100 psi (689 kPa) of air
tank pressure, have an assistant apply and hold
an 80 to 90 psi (550 to 620 kPa) brake applica-
tion.
3. Check to see if the colored over-stroke band on
each brake chamber pushrod is exposed.
If a band shows, the stroke is too long. Check
the foundation brake components for wear or
damage, and repair as needed.
4. Measure the applied chamber stroke. See
Table 2 for the proper stroke for the type of
chamber being used. If the stroke is too short,
the brakes may drag or will not fully apply. Check
for improper operation or adjustment of the auto-
matic slack adjuster.
f422663a 10/31/2018
B
A
C
C
D
1
1 2
2 3
3
5 6 4
4 6 5
D
A. Right-hand brake (viewed from below) .
B. Left-hand brake (viewed from below) .
C. Sheer sleeve above in this location.
D. Shelf above in this location.
Fig. 6, Bendix Radial Mounted Caliper Tightening Pattern (viewed from below)
Brakes
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Walk-In Van Chassis Maintenance Manual, October 2019
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