Audi RS7 Brake Lights Not Working - Common Ways To Solve

By Nick Marchenko, PhD

Experiencing a brake light failure in your Audi RS7 can be more than just inconvenient—it can also compromise your safety on the road. Noticing the problem often relies on external feedback, such as being informed by another driver or, less ideally, by law enforcement. While some vehicles alert you via the dashboard, the Audi RS7 may not, making it crucial for you to periodically check the functionality of your brake lights. Here's a comprehensive DIY guide to diagnosing and fixing brake light issues in your Audi RS7.

Step 1: Identify the Problem

First, determine which of the brake lights is not functioning. You may find that all the lights are out, only one side is out, or perhaps just the third brake light is malfunctioning.

Step 2: Check the Fuses

Begin with the basics by checking the fuses. The Audi RS7 features multiple fuses for the brake lights, including under the hood and inside the vehicle:

• Under the Hood: Locate the stop lamp fuse under the hood, remove it, and inspect it for any signs of damage or burning. If it appears intact, use a test light to ensure it’s functioning correctly. Ensure the ignition key is on to power the fuses during testing.
• Inside the Vehicle: Check the fuses related to the side brake lights and the high-mounted third brake light. Replace any blown fuses and retest the lights.

Step 3: Inspect the Bulbs and Sockets

If the fuses are intact, the next step is to examine the bulbs and their sockets:

• Bulb Inspection: Remove the bulb and check for any visible damage or signs of corrosion. Sometimes, the filament inside the bulb might be broken even if the bulb looks fine externally.
• Socket Inspection: Look for any corrosion or damage in the socket, which can prevent proper contact and functionality.

If your brake light bulb shows the signs of malfunction - change it to prevent future problems. If you need help in choosing light bulbs for your Audi RS7 - consult our bulb size chart below:

• 2018;
• 2017;
• 2016;
• 2015;
• 2014;

Step 4: Test Electrical Connections

Using a test light, verify both the power and ground connections at the bulb sockets:

• Power: Attach one end of the test light to a known good ground and probe the power terminal of the socket.
• Ground: Connect the test light to the battery positive and touch the ground terminal in the socket. A lighting test light indicates a good ground.

Step 5: Simulate Brake Pedal Activation

If you don’t have an assistant, you can simulate pressing the brake pedal by using a pry bar to press it down while you check the lights:

Ensure the vehicle is secure and that the ignition key is in the necessary position based on your Audi RS7’s specifications.

Step 6: Check the Brake Light Switch and Wiring

If the problem persists after checking bulbs and fuses:

• Brake Light Switch: Use a jumper wire to bypass the brake light switch connections. If the lights function with the jumper wire, the switch is likely faulty and needs replacement.
• Wiring and Connectors: Trace the wiring from the brake lights back to the switch and look for any signs of wear, damage, or loose connections. Pay particular attention to any junction blocks for signs of corrosion.

Step 7: Consult a Scan Tool

For a more in-depth diagnosis, consider using a scan tool that can monitor the brake pedal's on and off states. This can also help identify any codes related to the brake pedal switch or other related components.

Wrap-Up

By following these steps, you should be able to diagnose and fix common issues with your Audi RS7’s brake lights. Regular maintenance and checks can prevent such issues from becoming a safety hazard. Remember, if you're unsure about any step or if the problem persists despite your efforts, consulting a professional mechanic is advisable. Stay safe and ensure your vehicle’s brake lights are always operational!

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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