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For driving with a trailer, the yellow and red, if equipped,
knobs must be pushed in. When you are not pulling a
trailer, the red trailer air supply knob must be pulled out.
CAUTION:
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If you apply any one of the air brake parking
controls while the vehicle is moving, your rig
will stop suddenly. If you are not ready for
this, you or others could be injured. Do not
apply any one of these controls while you are
driving, unless you have to make an
emergency stop.
If the air pressure drops below 60 to 70 psi
(413 to 482 kPa), the primary brake light and warning
buzzer will come on. If the air pressure drops to
35 to 45 psi (241 to 310 kPa), the red trailer air supply
knob will automatically pop out and apply the spring
brakes on the trailer.
If the air pressure drops to 35 to 45 psi (241 to 310 kPa),
the yellow park brake knob will automatically pop out
and apply the spring brakes on the truck or tractor.
2-26
If you ever have a complete loss of air so that your air
brakes automatically apply, there is a way that the
tow operator can release the parking brakes to tow the
vehicle. See Towing Your Vehicle on page 4-21.
Parking Brake Burnish Procedure
All vehicles which have hydraulic brakes will have
a parking brake. It is recommended that the parking
brake be burnished as part of the new vehicle break-in.
The parking brake will work best after it has been
burnished following these instructions:
1. Making sure that there is no other traffic around,
get the vehicle speed up to 20 mph (32 km/h) and
pull up to apply the parking brake. Let the vehicle
come to a complete stop. Apply the base brakes
and disengage the parking brake.
2. Repeat the burnishing procedure in Step 1 a total
of 10 times
3. Between stops, drive the vehicle about
2
⁄
miles (4 km)
1
2
Notice: Driving with the parking brake on can
damage the transmission and brake system parts.
Verify that the parking brake is fully released and the
brake warning light is off before driving.
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