Oldsmobile 14078922 Switch Assembly, Cruise Control Release

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Cruise control is a speed control system which maintains the desired vehicle speed under normal driving conditions. Most systems use vacuum to operate a throttle servo unit, which is overseen by the controller or Cruise Control Module (CCM). The system provides several modes of operation including cruise, coast, resume/accelerate, most allow "tap up" and "tap down", an incremental increase or decrease in set speed. The system will not engage until the vehicle exceeds a minimum speed, usually 25 mph (40 kph). The main parts of the vacuum systems are the mode control switches, Cruise Control Module (CCM), servo unit, Vehicle Speed Sensor (VSS), vacuum supply, electrical and vacuum release switches, and electrical harness. The system operates by trapping vacuum when the servo is at the designated position, and the controller reacts to 3 vehicle or system states. The system components include the vacuum servo unit, EMC Controller/Actuator, Electronic Controller (Module), and Vehicle Speed Sensor (VSS). The system also includes a Vacuum Accumulator, which is used to maintain satisfactory cruise control performance in vehicles with low manifold vacuum at normal road speeds.