85
PROBLEM
CAUSE
SOLUTION
Air System (cont'd)
Poor braking performance
(cont'd).
Trailer brake lining wear
excessive.
Trailer brakes slow to apply.
Trailer service brakes slow to
release.
Slack adjuster not auto-
adjusting.
Cracked housing.
Worn clevis pin bushing.
Have authorized service center
check for adequate pressure and
timing balance relative to tractor/
trailer application.
Proceed per problem "trailer brakes
drag."
Check slack adjuster and chamber/
spring brake push rod angle 90°
applied with proper adjustment.
Check air delivery to all reservoirs
at system working pressure.
Check open lines - no kinks, bends,
closed shut-off cocks, restrictions,
excessive elbows.
Have authorized use of "jumper
hose analyser" and duplex gauge
to pin-point brake imbalance.
Check functional return spring in
service chamber or spring brake.
Check open lines - no kinks, bends,
closed shut-off cocks, restrictions,
excessive elbows.
Have authorized use of "jumper
hose analyser" and duplex gauge
to pin-point brake imbalance.
Check for damaged actuator rod.
Replace as required.
Slack adjuster internal components
seized. Replace.
Replace slack adjuster.
Replace bushing