Kenworth T410, Driver'S Handbook Manual

Page: 174 / 418

Page 148 CAT: 8612 November 2019
OPERATING INSTRUCTIONS
USING THE PARKING BRAKE
The yellow diamond-shaped knob on the dash controls the truck parking
brakes. These are spring brakes that you activate by releasing air pressure
from their chambers. When they are not in use, air pressure compresses
the springs and releases the brakes. Pulling the valve OUT applies the
parking brake, which exhausts air from the chambers and allows the springs
to extend and apply the brakes.
Do not leave the cab without applying the truck parking brake. The
truck could roll and cause an injury or accident.
BEFORE YOU LEAVE THE CAB
1. Apply parking brake. Pull out the Yellow Parking Brake Control
knob located on the dash. The red Trailer Air Supply Control
valve will automatically apply.
2. Shift the transmission into PARK position:
• Manual transmission, select Neutral.
• Automated and Automatic transmission, select Neutral.
3. Turn the key to the OFF position and remove the key.
The parking brakes act on the rear wheels only. They are spring-applied,
with air pressure used to release them.
Release air is supplied by both the front and rear circuit reservoirs through
a double check valve.
Trailer parking brake is not intended to be used as parking brake
for truck and trailer combination. The truck could roll and cause an
injury or accident.
TO RELEASE THE TRUCK PARKING BRAKES ONLY
• Push IN the yellow knob on the dash. Your trailer will remain parked.
• Below the threshold pressure of 207kPa (30psi) the Yellow valve
remains OUT (in the ON position) when you attempt to push it in.
See Air System Pressure Gauges on page 25 for more information.