PEC 013
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12/20/13
11.0
PACCAR Engine Brake
Overview
The PACCAR Engine Brake is a fully integrated engine compression brake that
provides braking forces through the driveline. It reduces wear on the service brakes
and improves vehicle control in deceleration events when active. The PACCAR
Engine Brake is customizable to meet the requirements of the operator or fleet. The
PACCAR Engine Brake operates using standard dash switches.
Standard Features
PACCAR Engine Brake ON/OFF Switch
Retarder Select Switch
Manual Mode (both with cruise control turned ON and OFF)
The PACCAR Engine Brake ON/OFF switch allows the operator to turn retarder ON
and OFF.
The Retarder Select Switch allows the operator to set how much power is provided
by the PACCAR Engine Brake. There are three levels of power provided by the
Retarder Select Switch, low, medium, and high.
The default setting for every PACCAR Engine Brake is Manual Mode. Manual Mode
allows the engine to provide braking when the PACCAR Engine Brake switch is in
the ON position, the engine is not being fueled, and the cruise control is inactive. The
operator can select between three levels of engine retardation (low, medium, and
high) through the Retarder Power Select Switch.
Whenever the PACCAR Engine Brake switch is in the ON position, the operator will
be notified by the driver display. Examples of the notification are provided in the
Additional Information
portion of this section.
Feature Options
Engine Brake Behavior When Cruise Control is ON:
o
Manual Mode
o
Coast Mode
o
Latch Mode
Auto-Retard
Downhill Speed Limiter (DSL)
The customer has the ability to select from three operating modes for the PACCAR
Engine Brake when the PACCAR Engine Brake ON/OFF switch is ON and cruise
control is ON and inactive. The three operating modes are mutually exclusive of one
another. The default setting is Manual Mode.
Manual Mode is the default setting for the PACCAR Engine Brake when the
PACCAR Engine Brake ON/OFF switch is ON and cruise control is ON and
