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Why is the brake light of Audi A6 always on?

2 Answers

OArya

07/24/25 8:21pm

Introduction to the reasons why the car brake light is always on: 1. Lack of brake fluid: It is an indispensable part of the car's braking system. When the driver steps on the brake pedal, the force from the pedal is transmitted by the piston of the brake master cylinder through the brake fluid to the brake cylinders located at the wheels, causing the brake pads to contact the wheels and achieve the purpose of stopping the vehicle. 2. Tail light bulb damage: The brake fluid cup has upper and lower lines. When the brake fluid inside is below the lower line, this phenomenon is sensed by the sensor next to the oil cup and reflected by the brake light on the dashboard. If the brake fluid decreases rapidly, it indicates a leak in the braking system. 3. Brake pads need to be replaced: Note that if you drive without releasing the hand brake, the light will also stay on.

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StMaggie

08/11/25 11:07am

I've seen quite a few cases where the Audi A6 brake lights stay on constantly, and most of the time it's due to a faulty brake light switch. This switch is located near the brake pedal and pops up to complete the circuit when you press the brake. If it's stuck or the spring fails, the switch remains engaged even when you're not braking, causing the lights to stay on. Another possibility is a short circuit in the wiring, especially the wires under the driver's seat that get rubbed or pressed by floor mats over time, leading to positive and negative wires touching. Some owners don't secure their aftermarket carpets properly, which can crush the wiring and cause this issue. If the brake pedal doesn't reset properly, it might not fully depress the switch, keeping the lights on. Additionally, water ingress in the fuse box can make the control circuit act up. I suggest first trying to lift the brake pedal with your foot to see if it resets properly. If that doesn't work, you'll need to have the switch and wiring checked. A professional repair shop can usually pinpoint the problem quickly using a diagnostic tool.

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