Peterbilt 325 2017, Operator'S Manual, Page: 270 / 392

AIR SYSTEM
Your authorized dealer carries
rebuild kits for most units.
Air Gauges and Air Leaks
Your vehicle comes with air pressure
gauges for two separate systems,
Primary and Secondary: the Primary
gauge indicates pressure in the rear
braking system; the Secondary gauge
indicates pressure in the front braking
system. Each gauge indicates the
amount of air pressure in pounds per
square inch (psi).
WARNING!
Do not operate the vehicle if leak-
age in the air system is detected.
Conduct the following procedure
and contact an authorized dealer (or
any other properly equipped service
center) if a leak is detected. Failure
to check the brakes or follow these
procedures could cause a system
failure, increasing the risk of an
accident and may result in death,
personal injury, equipment or prop-
erty damage.
If the light and alarm do not turn off at
start-up, do not try to drive the vehicle
until the problem is found and fixed. If
the pressure in either or both systems
is too low for normal brake operation,
i.e., the pointer of one gauge falls
below 65 psi (448 kPa), a warning light
on the gauge will glow and the audible
alarm will sound.
NOTE
Park brakes lock up at 60 psi (414
kPa), the audible alarm will sound at
65 psi (448 kPa).
Primary Air Pressure Gauge
5-60
Y53-6060-1C1 (03/17)
5