Brake Signal: Description and Operation

PURPOSE
Allows Powertrain Control Module (PCM) to monitor brake application.

OPERATION
The brake pedal switch closes when pedal is depressed.

The PCM uses this input to determine engine load and maintain idle speed.

The PCM vents speed control system vacuum and turns speed control system OFF when brake switch actuation is sensed.

The brake switch is also used as an input to signal deceleration.