freightliner Custom Classic MT45 2022 Maintenance Manual page 97

Brakes
Manufacturer
Meritor
* Long stroke design is indicated by a tag, or embossing, on the brake chamber.
†
Specifications are relative to a brake application with 80 to 90 psi (550 to 620 kPa) air pressure in the brake chambers.
5. Start the engine and build air pressure to at least
100 psi (689 kPa). Shut down the engine.
6. Check all of the foundation brake components for
damage, wear, and loose or missing parts. Re-
pair as needed.
42–06 Slack Adjuster
Lubrication
IMPORTANT: Perform
42–07 before lubricating the slack adjusters.
Automatic slack adjusters must be lubricated periodi-
cally to ensure proper brake operation.
WARNING
Failure to lubricate slack adjusters could lead to
dragging brakes or a brake failure, resulting in
property damage, personal injury, or death.
Meritor
Lubricate the slack adjuster at the grease fitting until
grease is forced past the pressure-relief capscrew or
past the gear splines around the inboard snap ring.
Use high-temperature, NLGI Grade 1 waterproof
grease. See Fig. 7.
Bendix
Using a quality multipurpose chassis lubricant, NLGI
Grade 2, lubricate the automatic slack adjuster
Walk-In Van Chassis Maintenance Manual, October 2019
Brake Chamber Stroke Specifications
Chamber
Type *
Standard Stroke
Long Stroke
Standard Stroke
Table 2, Brake Chamber Stroke Specifications
Maintenance Operation
Max Applied Stroke: inch (mm)
†
Size
9
12
16
20
24
24
30
1
2
7
10/20/93
1. Brake Chamber
2. Clevis
3. Actuator Rod
4. Boot
Fig. 7, Meritor Automatic Slack Adjuster (other slack
adjustors are similar)
through the lube fitting. See
slack adjuster until clean lubricant flows from the
grease relief opening in the boot.
42
Less than 1-1/2 (38)
Less than 1-3/4 (44)
Less than 1-7/8 (48)
Less than 2 (51)
3
4
5
6
f420012a
5. Pull-Pawl Seal
6. Manual Adjusting Nut
7. Grease Fitting (or
Lube Plug)
Fig. 8. Lubricate the
42/7