Mack CSM 2010, Operator'S Handbook Manual

Page: 116 / 232

108 OPERATION
On Slippery Road Surfaces
As with many aspects of operating a heavy-duty vehicle, special care should be taken when
using the MACK PowerLeash™ Engine Brake on slippery road surfaces. The potential for
unpredictable loss of vehicle traction is a serious concern; in some situations the engine
should not be used at all.
As always, approach untested driving conditions with caution. Avoid use of the MACK
PowerLeash™ Engine Brake in these situations until you have gained some experience
under normal driving conditions.
As a rule, make sure that the vehicle is demonstrating good tractability with the engine brake
off before checking for tractability with the engine brake enabled. Then, provided traffic
conditions are safe for "testing" tractability, switch the MACK PowerLeash™ Engine Brake
to the LOW position. If the vehicle shows any signs of loss of control (ABS activation or
vehicle swerving, for example), immediately switch the engine brake back to the OFF
position.
C0032891
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.
CAUTION
Do not enable the MACK PowerLeash™
Engine Brake during bobtail operations, or
when operating on slippery roads with an
empty or lightly loaded trailer.