Medium Duty Operator's Manual - Peterbilt Motors Company

INSTRUMENTS AND CONTROLS
Illuminates during normal operating conditions
to indicate a problem with the Trailer
ABS System. This should be checked by a
Peterbilt dealer as soon as possible. See
“ABS Warning Lamps” on page 104 for more
information.
NOTE:
•Tractors/Trucks and trailers built after 3/1/01
must be able to turn on an In-Cab Trailer ABS
Warning Lamp (per U.S. FMVSS121). The
industry chose Power Line Communication
(PLC) as the standard method to turn it on.
See “Trailer ABS Warning Lamp” on page 104
for more information
•On trailers built prior to 3/1/01 verify trailer
ABS system status via the required external
warning lamp mounted on the trailer. The
indicator lamp on the trailer should be yellow
and identified with the letters "ABS".
!
BRAKE
CONTROLS AND DISPLAYS
7. Axle, Inter-Axle Differential Locked
(Tandem Axles)
Illuminates when the inter-axle differential
switch is ON thus locking the inter-axle differential.
This powers the forward rear and the
rear rear differentials equally. When the
switch is turned off (inter-axle differential
unlocked) the engine power is allowed to flow
to any of the 4 drive tires based on the differential
effect (mostly to the forward rear differential).
(This feature is standard on all
tandem axles).
8.Brake System
Illuminates to indicate a malfunction in the
hydraulic brake system (when equipped with
Hybraulic brakes).
9.Clock, Alarm Bell
Illuminates when the alarm is set. It will flash
when the clock alarm is active.
– 24 – Y53-6008A Medium Duty (R05/09)