Thomas SAF-T-LINER C2, Maintenance Manual

Page: 122 / 176

42–14 Foot Brake Valve
Actuator Lubricating,
Bendix E–6
1. Remove the brake valve. For instructions, see
Group 42 of the Saf-T-Liner C2 School Bus
Workshop Manual .
2. From the outside of the cab, pull the valve away
from the frontwall and remove the brake plunger.
3. Wipe off the old grease from the plunger and the
adaptor.
4. Inspect the bore of the adaptor and the sliding
surface of the plunger. While some discoloration
is permissible, there should be no pitting or
roughness of the adaptor bore or the sliding sur-
face of the plunger. If pitting or roughness exists,
replace damaged parts with new ones.
5. Lubricate the adaptor bore and the sliding sur-
face of the plunger with an approved silicone-
based grease, Dow Corning 55 O-Ring Lubricant
(formerly Molykote DC–55M), or Loctite® V–755
O-Ring Lubricant.
6. Using a new gasket, install the plunger and
brake valve following the instructions in
Group
42 of the Saf-T-Liner C2 School Bus Workshop
Manual .
42–15 Brake Inspection
IMPORTANT: This procedure should be per-
formed prior to lubrication of the brake compo-
nents.
Vehicles Equipped with
Intellipark
™
IMPORTANT: If the vehicle is equipped with the
Intellipark electronic park brake system, perform
the steps below to place the vehicle in mainte-
nance mode in order to perform maintenance on
the park brake.
While in maintenance mode, the Intellipark func-
tionality is limited as follows.
•
Pushing or pulling the park brake button has no
effect on the park brake.
•
Roll-away mitigation is not active (no automatic
setting of the park brake).
1. With the vehicle on a level surface, release the
park brake.
2. With your foot off of the brake pedal, verify that
the vehicle is stationary, the ignition key is in the
ON position, and the dash electronic control unit
(DECU) switches are in the neutral position.
NOTE: The next four steps should be performed
within 10 seconds.
3. Press the foot brake pedal.
4. Release the foot brake pedal.
5. Push the yellow park brake button and hold it in
the pushed-in state continuously, until the end of
step 15.
6. Press the foot brake pedal and keep it pressed,
until the end of step 15.
NOTE: The next nine steps should be per-
formed within 40 seconds. Be aware that where
you stop cycling the ignition on one step is the
beginning of the next step. For example, at the
end of step 7 the ignition is OFF, and after wait-
ing for two seconds (step 8), the ignition is al-
ready in the OFF position to begin step 9.
7. Cycle the ignition key from ON to OFF three
times.
ON
→
OFF
→
ON
→
OFF
→
ON
→
OFF
8. Keep the ignition switch in the OFF position for
at least two seconds.
9. Cycle the ignition key from OFF to ON three
times.
OFF
→
ON
→
OFF
→
ON
→
OFF
→
ON
10. Keep the ignition switch in the ON position for at
least two seconds.
11. Cycle the ignition key from ON to OFF three
times. ON
→
OFF
→
ON
→
OFF
→
ON
→
OFF
12. Keep the ignition switch in the OFF position for
at least two seconds.
13. Cycle the ignition key from OFF to ON three
times. OFF
→
ON
→
OFF
→
ON
→
OFF
→
ON
14. Keep the ignition switch in the ON position for at
least two seconds.
15. Verify that the diagnostic light emitting diodes
(LEDs) start to blink.
Brakes
42
Saf-T-Liner C2 School Bus Maintenance Manual, November 2020
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