Speed Control Systems - Automatic: Description

System uses manifold vacuum to power a throttle servo unit. When speed adjustment is necessary, servo moves the throttle by receiving a varying amount of controlled vacuum from transducer. Speedometer cable from transmission drives transducer and a cable from transducer drives instrument panel speedometer. Engagement of transducer is controlled by engagement switch located at end of turn signal lever or on instrument panel. Two brake release switches are provided. An electric switch disengages transducer and a vacuum (switch) valve decreases vacuum in servo unit to quickly return throttle to idle position when brake pedal or clutch is depressed.