Mack TerraPro LEU 2010, Operator'S Handbook Manual

Page: 142 / 225

OPERATION 131
Work Brake System
The work brake system is designed to be used when frequent stops are made.
This type of operation, typical in house-to-house refuse collection, consumes
large volumes of air if the spring brake is applied at each stop. The work
brake system uses significantly less air volume than the spring brake system,
improving overall brake system durability.
In addition, the brake system incorporates backup features which apply the
spring brakes in the event of an engine shutdown or significant loss of air
pressure. With the work brake applied, spring brake application will occur if
the engine should be shut off or if a loss of air pressure is detected in the
primary system.
Operating the Work Brake System
Note: Always use the foot brake to bring the vehicle to a complete stop before
applying the work brake.
In normal operation, when the work brake is applied, the transmission will be
shifted into neutral from a forward or reverse gear and both the front and rear
axle service brakes will be applied. When the vehicle shifts to neutral from the
reverse gear, the transmission must be
manually shifted back into gear.
WARNING
Loss of vehicle control could occur if the vehicle is in motion when the work
brake is applied (due to wheel lockup on slippery surfaces). In addition, using
the work brake before the vehicle is stopped could throw the operator from
the normal driving position.
Work Brake Application from a Forward Gear
To apply the work brake and place the automatic transmission in NEUTRAL:
1. Bring the vehicle to a complete stop with the foot brake.
2. Lift and rotate the work brake lever clockwise (toward the driver).
3. Lower the lever into the locked (applied) position.