A Guide to the Brake Light Switch for the 2017-2021 BMW 740i
If your 740i has brake light issues or won't shift from park, the problem could be this small but critical switch.
- A faulty brake light switch can do more than affect the lights; it can prevent your 740i from starting or shifting out of park.
- Symptoms often include warning lights for the ABS or DSC systems on the dashboard.
- DIY replacement is a straightforward job that can be completed in under an hour, saving on labor costs.
- Ensure the replacement part cross-references to OEM part number 61319240076 for a correct fit on the G12 chassis.
Understanding Brake Light Switch Failure in Your BMW 740i
The brake light switch is a small, electronic sensor located on the brake pedal assembly inside the cabin. When you press the brake pedal, the switch sends a signal to your car's main computer. Because this switch is tied into so many systems, a failure can cause a variety of confusing symptoms beyond just the brake lights themselves. It's a common wear item that can fail from use over time.
Symptoms of a Failing Brake Light Switch
A bad brake light switch on the G12 chassis 740i can manifest in several ways. You might notice one or more of these issues:
- Brake Lights Don't Work: The most obvious symptom is that your brake lights do not illuminate when you press the pedal. This is a major safety hazard.
- Brake Lights Stay On: The switch can fail in the 'on' position, leaving your brake lights permanently lit, which can confuse other drivers and drain your battery.
- Cannot Shift From Park: For safety, your BMW requires a signal from the brake switch before it will allow the gear selector to move out of Park. If this signal is missing, you may be unable to shift.
- Dashboard Warning Lights: A faulty switch can trigger warning lights for the ABS and DSC systems, as they rely on the switch's signal to function correctly.
- Car Won't Start: The push-button ignition requires you to press the brake pedal to start the engine. If the switch is bad, the car won't recognize the pedal is pressed and may not start.
No Recalls Found
As of early 2026, there are no specific recalls from the National Highway Traffic Safety Administration (NHTSA) for the brake light switch on the 2017-2021 BMW 740i. Always check for the most current recall information using your vehicle's VIN.
Choosing the Right Aftermarket Replacement
When replacing the brake light switch, you have the option of a Genuine BMW part or an aftermarket part. For a component like this, a quality aftermarket brand can offer significant savings without a compromise in function.
Vemo is a German brand that produces a wide range of aftermarket electronic parts for European vehicles. Vemo parts are often considered a reliable and cost-effective alternative to dealer parts. For a simple electronic switch, a brand like Vemo provides a practical balance of quality and value, especially when compared to the higher cost of a part from the BMW dealer.
Cost of Replacing a BMW 740i Brake Light Switch
The total cost will depend on the price of the part and whether you perform the replacement yourself or use a professional mechanic. The job is straightforward and does not take much time.
| Item | Estimated Cost |
|---|---|
| New OEM Part | $55 - $120 |
| New Aftermarket Part (Vemo) | $84.58 |
| Shop Labor | $75 - $140 |
| Total (DIY with Aftermarket) | $84.58 |
| Total (Shop Install with Aftermarket) | $160 - $225 |
DIY Replacement is Possible
Replacing the brake light switch is a task that many owners can do themselves with basic tools. The switch is located above the brake pedal and typically unclips or unbolts after removing a lower dash panel. This can save you over $100 in labor costs.
Frequently Asked Questions
Where is the brake light switch located on my 2017-2021 740i?
The brake light switch is located in the driver's footwell, mounted to the brake pedal support bracket. You will need to look up above the brake pedal arm to see it.
Can a bad brake light switch cause ABS and DSC warning lights?
Yes. The stability control (DSC) and anti-lock brake (ABS) systems need to know when you are braking. A faulty switch can send an incorrect signal or no signal at all, causing the system to log a fault and turn on the warning lights.
Do I need to program or code a new brake light switch?
No. The brake light switch on this model is a direct replacement part. It does not require any special programming or calibration after installation. It is a plug-and-play component.
Is an aftermarket brake light switch a reliable choice for my BMW?
Yes, for this part, a quality aftermarket switch is generally a reliable and smart choice. Brands like Vemo are established in the European parts market and offer a dependable alternative to the more expensive Genuine BMW part, without sacrificing the simple on/off function required.
Technical Specifications
OEM Part Numbers: 61319240076
Located on the brake pedal support bracket. Connects to the main vehicle body control module. Functions as a critical input for brake lights, ABS, DSC, and engine start authorization.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- BMW 740i: