Vehicle Recovery and Spring Brakes Operating Instructions
– 110 – Y53-6008
Medium Duty (R10/06)
1. Into the pinion cage, add 1 pint (.47 liter) of lubricant.
2. Into the inter-axle differential, add 2 pints (.94 liter) of
approved lubricant.
• See “
Recommended Lubrication Types,” Page 136.
3. 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.
Spring Brakes — Manual Release
In order to tow a vehicle, if there is insufficient air to release
the parking brake, the 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 substantially and handling charac-
teristics while braking will be affected. You could
lose control of your vehicle, be severely injured,
or cause an accident. Have it towed to the near-
est dealer or qualified workshop for repair.
You may sometimes have to release your vehicle's spring
brakes by hand. This could happen if the system air pressure
does not reach operating pressure because your engine or
compressor is not working properly. You will have to release
the spring brakes at the spring brake chambers.
WARNING! Do not disassemble a spring brake
chamber. These chambers contain a powerful
spring that is compressed. Sudden release of
this spring can cause you to be severely injured.
• Do not operate a vehicle when the spring brakes
have been manually released. Driving a vehicle after
its spring brakes are manually released is extremely
dangerous. You will probably have no brakes at all.
You could have a serious or fatal accident.
• Releasing the spring brakes on an unsecured vehi-
cle could lead to an accident. The vehicle could roll,
causing severe injury. Always secure the vehicle
with wheel chocks, chains, or other safe means to
prevent rolling before manually releasing the spring
brakes.
To move a vehicle immobilized by the spring brakes due to
loss of air pressure in the brake system, perform the following
procedure:
