Braking and Traction Telltale Lamps
Telltale
Lamp
Color
Description
Related Information
Green
Regenerative
Braking
Indicates regenerative braking has been
activated by moving the right-hand stalk switch
into position 1, 2, or 3 (low, medium, or high).
A blue line appears on
the charge portion of the
power gauge showing the
amount of available
regenerative braking
requested.
Green
Descent Control
Mode
Indicates descent control mode is active.
The driver should always
be ready to intervene by
applying the service
brakes. On steep roads
regenerative braking may
not be able to maintain
the vehicle set speed.
Amber
Hill Start Aid
Disengaged
A blinking telltale indicates hill start aid is off.
A solid telltale indicates a fault with the
system.
To turn on HSA, press the
HSA OFF switch again or
cycle the vehicle
keyswitch.
Grey
Brake Hold Mode
Engaged
Indicates brake hold mode is active.
The service brake is maintained when the
driver takes their foot off the brake pedal.
To release the brake hold,
press the accelerator
pedal, engage the park
brake, or rapidly apply
and release the brake
pedal.
Red
Park Brake
Engaged
Indicates the park brake is engaged.
Always engage the park
brake before exiting the
vehicle.
Red
Low Brake Air
Pressure
Indicates air pressure in the primary or
secondary reservoir has dropped below
approximately 70 psi (483 kPa).
Bring the vehicle to a safe stop and have the
air system repaired before continuing.
A buzzer sounds if the
park brake is released or
the vehicle is moving
when the air pressure is
below 70 psi.
Amber
Tractor Antilock
Brake System
(ABS)
Momentary illumination indicates the vehicle
ABS is engaged.
Solid illumination indicates a problem with the
vehicle ABS. Repair the ABS to ensure full
braking capability.
Even if the ABS is
completely inoperative,
normal braking ability is
maintained.
Amber
Trailer Antilock
Brake System
(ABS)
The telltale will not illuminate if an
incompatible trailer is connected to the tractor.
Momentary illumination indicates the trailer
ABS is engaged.
If the telltale lamp illuminates momentarily
during vehicle operation, then shuts off, a fault
was detected and corrected.
Solid illumination indicates a problem with the
trailer ABS. Repair the trailer ABS immediately
to ensure full braking capability.
N/A
Brake Systems
11.9
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