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. There are 2 control switches operating speed control. The first is a "CRUISE" slide switch with "OFF", "ON", and "RESUME" positions. The second is a "SET-COAST" button switch located on end of turn signal lever. It controls engagement of transducer. Two brake release switches are provided. An electric switch disengages transducer and a vacuum valve (switch) decreases vacuum in servo unit to quickly return throttle to idle position when brake pedal or clutch is depressed.