Powertrain Controls - freightliner M2 Plus 2023 Manual

Driver Controls
disconnecting a trailer or when operating a vehicle
without a trailer.
Trailer Brake Lever
The trailer brake lever is used to apply the trailer
service brakes without applying the truck or tractor
service brakes. It is usually mounted on the right-
hand control panel. Move the lever down to apply the
trailer brakes; move the lever up to release the trailer
brakes. The lever automatically returns to the up
position when it is released. See
can be partially or fully applied, but in any partially on
position it will be overridden by a full application of
the service brake pedal.
Antilock Braking System
The Meritor ™ WABCO® Antilock Braking System
(ABS) passively monitors vehicle wheel speed at all
times, and controls wheel speed during emergency
stops or wheel lock situations.
During emergency or reduced-traction stops, fully
depress the brake pedal until the vehicle comes to a
safe stop. Do not pump the brake pedal. With the
brake pedal fully depressed, the ABS controls all
wheels to provide steering control and a reduced
braking distance.
The ABS is designed to communicate with a trailer
ABS, if they are compatible. Compatibility will result
in the illumination of the trailer ABS lamp during
vehicle start-up and fault detection. The trailer ABS
lamp will not illuminate unless a compatible trailer is
connected to the tractor.
Vehicles with ABS may have Automatic Traction
Control (ATC). On these vehicles, the ATC system
automatically limits wheel spin during reduced-
traction situations. In normal braking applications, the
standard air brake system is in effect.
Pressing the ATC SPIN switch shown in
shuts ATC off and allows drive wheel spin. Pressing
the switch again, or cycling the ignition key, cycles
the system back to normal operation.
NOTICE
The ATC spin feature is intended to be used
under specific slippery conditions that require
momentary increased wheel spin. Using this
option for an extended period of time may
damage the vehicle brake system.
4.7
Fig. 4.7. The lever
Fig. 4.11
03/02/2016
Fig. 4.11, ATC SPIN Switch

Powertrain Controls

Aftertreatment System Regen
Switches
NOTE: See Chapter 13
Efficiency, for detailed information about the
operation of the regeneration (regen) switches
and the aftertreatment system (ATS).
Regen may be started manually with the optional
digital switch in the ICU. See
10/28/2016
Fig. 4.12, Regen Start Digital Switch - ICUC
Some vehicles may be equipped with a regen inhibit
switch. See Fig. 4.13. To stop a regen in progress or
prevent the start of a regen, press the upper half of
the switch. Regen is delayed until the switch is no
longer active.
ATC
SPIN
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Emissions and Fuel
Fig. 4.12.
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