freightliner Custom Classic MT45 2022 Maintenance Manual page 93

Brakes
2
1
3
06/20/2002
1. Flange-Head Bolt
2. Leading Pin
Fig. 2, ZOH-T Slide Pins and Bolts
3
1 2
3
06/20/2002
1. Hexhead Bolt
2. Blue Patch
Fig. 3, ZOPS Slide Pins and Bolts
the anchor plate slide pins (trailing side) has
notches for identification. With ZOH-T calipers,
install the solid pin (no bushing) only in the an-
chor plate leading hole position. Install the pin
with the rubber bushing and notches only in the
anchor plate trailing hole position. Tighten the
leading-side pin first, then tighten the trailing-
side pin.
Tighten ZOH-T bolts 93 to 107 lbf·ft (126 to 145
N·m). Tighten ZOPS bolts 70 to 80 lbf·ft (95 to 108
N·m).
42–05 Brake Inspection
IMPORTANT: This procedure should be per-
formed prior to lubrication of the brake compo-
nents.
Walk-In Van Chassis Maintenance Manual, October 2019
4
f422357
3. Trailing Pin
4. Rubber Bushing
f422358
3. Slide Pin
If the brakes must be repaired, or they require
adjustment, see Group 42 of the Walk-In Van
Chassis Workshop Manual for repair, adjust-
ment, and troubleshooting procedures. Or take
the vehicle to an authorized Freightliner dealer.
Pneumatic (Air) 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.
Mechanical Parking Brake
Component Inspection
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.
2. If more than 3/4 of the available travel of the
parking brake is required to hold the vehicle, the
parking brake lining should be checked and, if
needed, repaired by an authorized Freightliner
dealer.
3. Inspect the parking brake shoes for lining wear. If
thickness of any lining material is worn to within
0.030 inch (0.79 mm) of the shoe table at the
thinnest place, replace both of the shoe and lin-
ing assemblies.
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.
42
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