by 
The Curious Bag
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Clutch brakes are used almost exclusively in large truck, agricultural and racing applications. These specialized devices allow those vehicles using non-synchronized transmissions to engage first gear without grinding or inadvertent movement.
Non-Synchronized Transmissions
Industrial diesels and sport bikes use transmissions without synchronizers, which would allow the user to shift more easily from one gear to the next. Synchros are often omitted in these applications because they are so easily damaged by high-torque engines.
First Gear Engagement
Since a driver cannot engage first gear in a non-synch transmission while the flywheel is spinning, a clutch brake is used to stop the assembly from moving.
Function
There are a number of clutch brake designs, but the most common resembles the main clutch in miniature. A small, stationary disk clutch presses against the flywheel to create friction and cease rotation.
Material
Clutch brakes usually use an organic-metallic friction material, but some use carbon- ceramics for greater longevity.
Clutch Brake Engagement
The clutch brake is engaged by pressing the clutch pedal all the way to the floor, and disengages after about 2 inches of lift.
Source:
Resource:
How Clutches work (Video)
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