When the clutch pedal is operated, the movement of the piston causes pressure to build up in the clutch master cylinder, which is passed through the hydraulic line to the slave cylinder. From here, the pressure is relayed to the release mechanism, which opens the clutch and thus breaks the flow of power from the engine to the transmission.
Two indicators on each side, one at the front and one at the rear, are stipulated for trucks and buses. When used, these must illuminate with a frequency of 1.5 Hz (± 0.5 Hz) = 90 x per minute (± 30 x) on both sides simultaneously. The indicators are operated with a steering column switch on the steering column.
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