Brake Switch (Cruise Control): Description and Operation

Brake pedal switch
The vehicle utilized 2 brake pedal switches, mounted on the pedal box. One switch is normally closed with the brake pedal released while the other is normally open. The normally closed switch also incorporates a vent valve to rapidly deplete actuator vacuum when cruise control is disengaged. When the brake pedal is pressed, the signal from each brake switch is monitored by the cruise control ECU which switches the vacuum pump off.