Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Operating Instructions
Using the Brake System
Brake Warning Lamp
When the brake warning lamp comes on, it indicates a malfunction
in the brake system. Possible malfunctions include
loss of hydraulic pressure from the power steering circuit or a
pressure differential between the primary and secondary
brake circuits.
WARNING! Do not operate the vehicle if the
brake light or buzzer comes on. The light or
buzzer indicates a failure in one of the brake
components/system. Drive your vehicle to the
side of the road immediately. Failure to do this
may lead to an accident and severe injury.
0
OIL
!
BRAKE
MIRROR
HEAT
LOW
WATER
WATER
SERVICE BRAKE WARNING INDICATOR
If the buzzer sounds while driving, or if the BRAKE light
comes on, do the following:
1. Slow down carefully.
Here are some things you can do to assist in slowing
the vehicle:
• Downshift - Putting the transmission into a lower
gear will help slow the vehicle.
Medium Duty (R10/06) Y53-6008 – 91 –