Mack TerraPro LEU 2010, Operator'S Handbook Manual

Page: 134 / 225

OPERATION 123
C0029335
1. High 3. Off
2. Low
Only if the vehicle demonstrates good control in the LOW position (again, only
in safe driving conditions) should you test in the HIGH position, if desired.
Return to the LOW position and proceed with caution if there is any sign of
loss vehicle control.
Note: Always monitor vehicle tractability in slippery road conditions, and make
adjustments to engine brake switch position and vehicle speed as necessary. Always
test the LOW power position setting before moving to the HIGH position.
Your MACK PowerLeash™ Engine Brake and ABS control systems are
designed to work together for optimized vehicle control. The engine brake
function may be modified or interrupted briefly in the event of pending wheel
lock.