Mack CSM 2010, Operator'S Handbook Manual

Page: 147 / 232

OPERATION 139
Clutch Brake Operation
The clutch brake is designed to stop the rotation of the transmissions input shaft while the
truck is standing still. This makes shifting into first or reverse gears easier. Inadvertent use
of the clutch brake will make shifting from a gear difficult (i.e., shifting from reverse with
the clutch brake applied and the vehicle is stationary).
C0032894
1 With the vehicle standing still, apply the clutch brake by pushing the clutch pedal all the
way to the floor; the clutch brake is applied when the clutch pedal is fully depressed (the
last one inch of travel past normal pedal travel).
Note: When the clutch is disengaged, a slight but definite resistance to clutch pedal
downward travel will be felt in the last one inch.
2 Shift the transmission into first or reverse gear, engage the clutch and accelerate. The
clutch brake is only to be used when the vehicle is stopped and is shifted into first or
reverse gears. It is not designed to be used as an upshifting aid.
CAUTION
Clutch brake damage may result if used
while the vehicle is in motion. The clutch
brake must NOT be used when making a
downshift or an upshift.