Returning Vehicle To Service; Spring Brakes-Manual Release - Peterbilt 348 2017 Operator's Manual

VEHICLE RECOVERY AND SPRING BRAKES

Returning Vehicle to Service

You will have to add lubricant to
prevent damage after your vehicle has
been towed.
2
1. Into the pinion cage, add 1 pint
(.47 liter) of lubricant or into the
interaxle differential, add 2 pints
(.94 liter) of approved lubricant.
2. After adding the specified type
and amount of lubricant, drive the
vehicle. It should be unloaded.
Drive 1 to 2 miles (1.5 to 3 km)
at a speed lower than 25 mph
(40 km/h). This will thoroughly
circulate the lubricant through the
assembly.
2-20
Spring Brakes—Manual
Release
Recovering a vehicle requires that you
release the parking brakes. There may
be times when there is not enough air
pressure to release the parking brakes.
In such cases, the parking brakes
(or Spring Brakes) can be manually
released.
WARNING!
Do not drive vehicle with malfunc-
tioning brakes. If one of the brake
circuits should become inoperative,
braking distances will increase sub-
stantially and handling characteris-
tics while braking will be affected.
You could lose control of your vehi-
cle or cause an accident. Have it
towed to the nearest dealer or qual-
ified repair facility for repair. Failure
to comply may result in death, per-
sonal injury, equipment or property
damage.
Y53-6060-1C1
The brakes can be released in this
manner should the pressure in the air
system not be enough to release them.
This may occur in instances where
the engine's air compressor is not
able to get the system up to operating
pressure.
WARNING!
Do not disassemble a spring brake
chamber. These chambers con-
tain a powerful spring that is com-
pressed. Sudden release of this
spring may result in death or per-
sonal injury.
(03/17)