freightliner S2 Operator's Manual page 107

Pre- and Post-Trip Inspections and Maintenance
23.6 Inspect the air tubing, especially tubing
made of nylon. In cold weather, nylon tub-
ing is sensitive to damage, such as nicks
or cuts. Have nicked or cut tubing re-
placed, even if it is not leaking.
NOTE: The front brake lines flex continu-
ously in vehicle operation, so they require
special examination. Give particular attention
to the areas near where they connect to the
front air brake chambers.
23.7 This inspection requires two people, one
in the driver seat, and another to inspect
the brake line connections at the wheels.
Both wheel air lines must be inspected
with the emergency brake set, engine
idling, air pressure at 80 to 90 psi (550 to
620 kPa), and the brake pedal held down.
23.8 Turn the wheels to full lock in one direc-
tion and inspect both air lines where they
connect to the air chambers, then turn the
wheels to full lock in the other direction
and inspect both lines. If a hose is leak-
ing, have it replaced.
IMPORTANT: ABS-equipped vehicles operat-
ing in regions where especially corrosive ice
removal chemicals are used may experience
higher than normal rotor corrosion. Tone
rings should be routinely inspected for corro-
sion. Severe corrosion of the integral ABS
tone ring may cause the ABS warning lamp
in the dash to illuminate due to false wheel
speed readings. If the ABS warning lamp
illuminates at any time other than at vehicle
start-up, have the problem repaired immedi-
ately.
24. Inspect the slack adjusters.
24.1 Meritor Slack Adjusters: Check the boot
for cuts, tears, or other damage. Have it
replaced if necessary.
24.2
Gunite Slack Adjusters: Inspect the slack
adjuster for any signs of damage. If dam-
aged, have the slack adjuster replaced.
Inspect the slack adjuster boot for cuts or
tears. If the boot is damaged, have it re-
placed. See Fig. 15.13.
4
3
2
1
06/17/2003
1. 7/16-inch Adjusting Nut
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. 15.13, Gunite Automatic Slack Adjuster
24.3
Haldex Slack Adjusters: Inspect each
slack adjuster and anchor strap for dam-
age. Have any damaged components re-
placed.
25. Check the air brake system for proper operation.
25.1 Check the air governor cut-in and cut-out
pressures as follows:
Run the engine at fast idle. The air gover-
nor should cut out the air compressor at
approximately 120 psi (827 kPa). With the
engine idling, apply the brake pedal sev-
eral times. The air governor should cut in
the air compressor at approximately 100
psi (689 kPa). If the air governor does not
cut in and out as described above, it must
be adjusted to these specifications. If the
air governor cannot be adjusted or re-
paired, replace it before operating the ve-
hicle.
25.2 Check the air pressure buildup time as
follows:
5
6
7
8
9
10
f421398
15.10