Regional Haul Model Operator's Manual - Peterbilt Motors Company

DASH- AND DOOR-MOUNTED FEATURES
Jacobs Engine Brake or Cummins “C” Brake
Switch
The ON/OFF switch turns the system ON or OFF. The
second switch performs the progressive braking function
that controls the amount of retarding.
CONTROLS AND DISPLAY
• If you have the two-mode system, you can select
HIGH or LOW.
• If you have the three-mode system, you can select
low, medium, or high retarding.
WARNING! Do not use the Jacob’s brake as
the primary means of slowing or stopping the
vehicle. The Jacob’s brake is designed to be
used in conjunction with the service brakes.
Failure to do this may cause death or personal
injury.
Interaxle Differential Lock Switch
The interaxle differential allows differential action between
the forward rear and the rear rear driving axles. The interaxle
differential lock switch allows the operator to LOCK
or UNLOCK the differential. The guard over this switch
prevents you from accidentally activating the lock.
2-Mode and 3-Mode Systems
– 60 – Y53-6033 Regional Haul (R05/10)