The Cruise Master is a speed control system which employs engine manifold vacuum to power the throttle Servo unit. The Servo moves the throttle when speed adjustment is necessary by receiving a varying amount of bleed air from the Regulator unit. The Regulator varies the amount of bleed air through a valve system which is linked to a speedometer-like mechanism. The speedometer cable from the transmission drives the Reguator and a cable from the Regulator drives the instrument panel speedometer. The engagement of the Regulator unit is controlled by an Engagement Switch located at the end of the turn signal lever. Two brake release switches are provided: an Electric Switch disengages the Regulator unit and a Vacuum Switch decreases the vacuum in the Servo unit to quickly return the throttle to idle position.
Chevrolet Service News Volume 38 - September - October 1966 - Number 9
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