Brakes
Brake Pedal Sensor
The brake pedal sensor tells the ECU and brake-by-wire systems when and how hard you press the pedal.
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Brake system flow
Interactive — tap a partTap a part to see how it fits in the system.
What it does
- Reads pedal position and travel
- Feeds brake lights, cruise control and start-stop
- Used by stability control
When it fails
- Brake lights stay on or never come on
- Cruise control inoperative
- Start-stop misbehaves
- Warning light
How to diagnose
- Watch brake light operation
- Read sensor live values
- Test the switch circuits
Maintenance
- Adjust the pedal switch if out of spec
Use the diagnosis order. When a part fails, confirm each hypothesis with measurements before replacing anything — codes and symptoms overlap.
Related part
Master Cylinder
The master cylinder converts pedal force into hydraulic pressure for all four brakes.