freightliner S2 Operator's Manual page 106

Pre- and Post-Trip Inspections and Maintenance
DANGER
Do not loosen or remove the parking brake clamp
ring for any purpose. See
emergency brake section of the brake chamber is
not intended to be serviced. Serious injury or
death may result from sudden release of the
power spring.
Before doing any repairs or adjustments on a
service/parking brake chamber, read the appli-
cable warnings and instructions in Group 42 of
the S2 Chassis Workshop Manual.
WARNING
Do not operate the vehicle with the front brakes
backed off or disconnected. Backing off or dis-
connecting the front brakes will not improve ve-
hicle handling and may lead to loss of vehicle
control resulting in property damage or personal
injury.
NOTICE
If the external breather tube or breather cap is
missing or incorrectly installed, road dirt and de-
bris can adversely affect the operation of the
brake chamber. Once inside of the chamber, dirt
and debris can cause the internal parts of the
chamber to deteriorate faster.
22.1
Check that the air brake chamber is
mounted securely on its mounting bracket,
and that there are no loose or missing
bolts.
22.2 Look for worn clevis pins on brake cham-
ber pushrods, and missing or damaged
cotter pins on brake chamber pushrod
clevis pins. Replace worn clevis pins and
install new cotter pins if necessary.
22.3 See if the chamber piston rod is in line
with the slack adjuster. Misalignment can
cause the piston rod to rub on the non-
pressure chamber and cause a dragging
brake. See Group 42 of the S2 Chassis
Workshop Manual.
22.4 Inspect the exterior surfaces of the cham-
ber for damage. Make sure that breather
holes in the non-pressure section(s) are
15.9
Fig. 15.11. The parking/
open and free of debris. See Group 42 of
the S2 Chassis Workshop Manual to re-
place any damaged parts.
22.5
On all parking brake installations, make
sure the end cover cap or dust plug is se-
curely snapped into place.
NOTE: On most MGM parking brake cham-
bers equipped with an integral release bolt,
an end cover cap is installed over the re-
lease bolt.
22.6 Check for rusted connections, missing
snap rings, and damaged camshaft
grease seals. Have damaged or missing
parts repaired or replaced.
23. Inspect the air brake lines.
23.1
Check the clearance between the hoses
and the exhaust manifold or other hot
spots. Excessive heat will cause material
in the hoses to deteriorate rapidly or be-
come brittle. Provide at least 6 inches
(150 mm) of clearance. More clearance is
recommended if the hose is located above
the heat source.
23.2 Check for kinks, dents, or swelling of the
hoses. If damaged, have the hose re-
placed with the same size and type.
NOTE: Do not route the hose on top of any-
thing likely to be stepped on.
23.3 Check for damage to hoses located near
moving parts, such as drivelines, kingpins,
suspensions, and axles. If moving parts
are catching or pinching the lines, correct
as needed.
23.4 Check for hose damage caused by abra-
sion. If abraded, have the hose replaced.
Check for the cause of abrasion, such as
loose or damaged hose clamps. Have the
clamps repaired or replaced as needed.
23.5 Observe the hose cover condition, espe-
cially hoses exposed to water splash and
ice. If dried out or ragged (the wire or liner
is showing through the cover), have the
hose(s) replaced.