Clutch control mechanism divided into mechanical steering mechanism

 Hydraulic control mechanism, in order to reduce taper roller bearing lutch pedal force, and not because of the transmission gear ratio is too large to increase the pedal stroke, in some heavy-duty trucks and some cars with a clutch pedal power devices. There is also a pressure-assisted clutch control mechanism using the engine driven air compressor operation as the main energy sources, the driver's body as a secondary or backup the manipulation of energy, more with the car's air brake system or other pneumatic devices share a compressed air source.