freightliner FL80 1998 - Automatic Slack Adjuster Inspecting and Adjusting (Gunite)

1.1 Apply the parking brakes. Chock the tires
to prevent vehicle movement.
1.2 Remove one or more of the lining inspec-
tion plugs, and measure brake lining
thickness.
1.3 On front and rear axles, replace linings
worn to less than 1/16 inch (1.6 mm).
1.4 Make sure that the brake rotor and linings
are free of oil and grease.
1.5 Install the inspection plug(s).
2. If the wheel and hub assembly is removed from
the axle, check lining wear. Replace the linings
on all brake assemblies if worn to less than 1/16
inch (1.6 mm) at the thinnest point.
NOTE: To replace the brake linings, see the ap-
plicable foundation brake section in Group 42 of
the
Business Class
®
Trucks Service Manual .
42–22 Brake Lines Checking,
Hydraulic Disc Brakes
Check all hydraulic lines and fittings for damage,
leakage, or looseness.
Replace damaged or leaking components, and
tighten loose fittings.
42–23 Power Booster
Checking, Bendix
Hydro-Max
®
Check for proper operation; see Group 42 of the
Business Class
®
Trucks Service Manual for instruc-
tions.
42–24 Automatic Slack
Adjuster Lubricating,
Gunite
Lubricate the slack adjuster until grease flows from
the grease relief opening. See Fig. 10. For tempera-
tures to –40°F (–40°C), use Lubriplate Aero; for tem-
peratures to –20°F (–29°C), use Texaco Multifak
EP-2 or Mobil Grease No. 77.
42–25 Automatic Slack
Adjuster Inspecting and
Adjusting, Gunite
1. Inspect the slack adjuster for structural damage.
Replace the slack adjuster if needed.
2. Inspect the slack adjuster boot for cuts or tears.
If the boot is damaged, replace it (see Fig. 10).
2.1 Remove the two clevis pins.
2.2 Rotate the worm shaft adjusting hexnut
counterclockwise to move the link away
from the clevis. About 45 lbf·ft (60 N·m) is
needed. You will hear a clicking sound.
f420653a
1
2
3
4
5
6
7
8
10
9
10/27/93
1. 7/16-Inch Adjusting
Hexnut
2. Grease Fitting
3. Boot
4. Link
5. Brake Chamber Piston
Rod
6. Clevis
7. 1/2-Inch Clevis Pin
8. 1/4-Inch Clevis Pin
9. Grease Relief
Opening
10. Slack Adjuster Spline
Fig. 10, Gunite Automatic Slack Adjuster
Brakes42
Business Class Trucks Maintenance Manual, October 199842/12