Exhaust Braking Systems - freightliner M2 Plus 2023 Manual

to maintain the designated road speed under these
conditions.
If the engine is equipped with both cruise control and
an engine brake, the engine brake can operate
automatically while cruise control is activated. The
maximum amount of braking is selected with the
engine brake control. When the vehicle returns to the
set cruise speed, the engine brake turns off.
The engine brake only operates when the accelerator
and clutch pedals are fully released.
ABS has the ability to turn the engine brake off if
wheel slip is detected. The engine brake
automatically turns back on once wheel slip is no
longer detected.
Engine Brake Operation
NOTICE
Do not allow the engine to exceed its governed
speed, or serious engine damage could result.
NOTE: Depending on the brake type, the engine
brake may be disabled when engine
temperature falls below a set level.
The engine brake control is located on the right-hand
steering column lever. At the top position, the engine
brake is off, and at the three lower positions, the
engine brake is on and the intensity (low, medium,
high) increases with each step down. See
NOTE: The cruise control system and safety
systems may activate the engine brake
regardless of the lever position.
NOTE: On vehicles equipped with a Detroit
automated transmission, setting the engine
brake with the cruise control set activates
Deceleration Mode. Setting the cruise control
while the engine brake is on activates Descent
Control Mode. For information on these modes,
see "Cruise Control" in

Exhaust Braking Systems

Exhaust Brake Switch
The optional exhaust brake is controlled by a dash-
mounted rocker switch to help slow the vehicle when
the accelerator is released.
To turn the exhaust brake on, press on the upper
part of the rocker (at the light inside the switch). The
Fig. 11.2.
Chapter 7.
02/17/2017
0. Off
1. Low
Fig. 11.2, Engine Brake Positions, Right-Hand Steering
Column Lever
exhaust brake turns off automatically. See
or Fig. 11.4.
11/28/2001
Fig. 11.3, Exhaust Brake Switch
03/31/2009
Fig. 11.4, Exhaust Brake Switch
Brake Systems
0
1
2
3
f270164a
2. Medium
3. High
Fig. 11.3
f610589
f610589a
11.4