C 2500 Truck 2WD V8-350 5.7L (1988)
Brake Switch (Cruise Control): Description and Operation
The brake pedal is equipped with two switches: a combination stop light/cruise control/TCC switch and a plunger type release switch. Each switch
disengages the cruise control system when the brake pedal is depressed. When the brake pedal is released, the system will remain disengaged.