OPERATING THE BRAKE SYSTEM
4
1. Normal Run Position
2. Trailer Park with Vehicle
Released
3. System Park or Trailer
Charge with Vehicle Parked
brake pedal application to provide the Parking Brake
equivalent braking to a bobtail tractor
not equipped with a proportioning
system.
4-22
Y53-6047–2C
Parking brakes work in reverse action
of the regular brakes. When the
parking brakes are engaged, air is
exhausted from the spring chambers,
which allows the spring to engage the
brakes. This design also provides a
safety function if a brake circuit has a
leak and loses air. In such a scenario,
the parking brakes will apply.
The vehicle’s
parking brake controls
are the yellow diamond shaped knob
on your dash board. If the vehicle is
equipped to tow a trailer, then there will
be an additional red octagon shaped
knob for the trailer parking brakes.
Parking brakes will be engaged when
either of these knobs are pulled OUT.
(If one knob is pulled out, the other
knob will automatically pop out.)
Pushing IN
a knob will disengage
the respective parking brakes. If you
push in the yellow knob only, you
will disengage the vehicle’s parking
(04/13)
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