In a Brake by Wire system, which component sends brake requests to the Brake Control Module?

• A. Pedal position transducers
• B. Hydraulic pressure sensors
• C. Wheel speed sensors
• D. Master cylinder

Answer: (A)

Brake-by-wire uses an electronic signal to request braking rather than a direct mechanical link. The pedal position transducer measures how far the pedal is pressed and sends that information to the Brake Control Module. The BCM then interprets this input as the driver’s braking intent and commands the hydraulic brake actuators to apply the appropriate braking force. Hydraulic pressure sensors and wheel speed sensors provide data for control and safety, but they do not initiate the brake request themselves. In this system, the master cylinder isn’t the source of the brake request; braking is driven by the BCM’s commands derived from the pedal position signal.