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Why is the brake light of BYD S7 always on?

6Answers
DelBarrett
07/24/2025, 10:09:22 AM

The brake light of BYD S7 staying on continuously is likely due to aging, cracking, or detachment of the brake pad shims. Below are the reasons and solutions for the brake light of BYD S7 remaining on: 1. Lack of brake fluid: Brake fluid plays a crucial role in the vehicle's braking system. When the driver presses the brake pedal, the force applied is transmitted by the piston in the master cylinder through the brake fluid to the wheel cylinders at each wheel, causing the brake pads to contact the wheels and stop the vehicle. Solution: Refill the brake fluid promptly. 2. Faulty brake switch: This usually happens when there is poor contact between the brake pedal and the brake sensor switch or the sensor switch is defective. Solution: Disassemble and inspect the switch. 3. Worn or aged brake pads: Worn or aged brake pads may also cause the brake light to stay on. Solution: Check the thickness of the brake pads.

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WilliamAnn
08/10/2025, 02:54:48 AM

Last time I drove my friend's BYD S7, I also encountered the issue of the brake lights staying on. The main thing to check is the sensor switch near the brake pedal. If that little thing gets stuck or gets water inside causing poor contact, the light will stay on. First, check if the floor mat is obstructing the brake pedal, then manually press the switch to see if it rebounds smoothly. Another possibility is a short circuit in the wiring, especially the bundle of wires under the trunk lid panel, which often bends and can easily get exposed and ground out. If you can't fix it yourself, it's best to go to the 4S shop to replace the sensor module as soon as possible. Otherwise, the battery might drain completely, and you could easily get rear-ended at night. My friend's car ended up costing a little over 200 yuan to fix. It's not a major issue, but it needs to be dealt with promptly.

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AddysonMarie
09/25/2025, 02:33:16 AM

A constantly lit brake light is no trivial matter. As a car repair shop owner, I often encounter BYD S7 owners reporting this issue. In 80% of cases, it's caused by a faulty brake light switch - that small plastic component atop the brake pedal that gets stuck when it should disengage upon pressing. For DIYers, first disconnect the negative battery terminal, then crawl under and remove two screws to replace the switch, though non-professionals are advised against attempting this. Another possibility is worn-out brake light wiring causing a short circuit, especially the wire harness near the left rear wheel arch which is particularly vulnerable. Additionally, high-pressure car wash jets directed at the pedal area may cause water ingress and switch malfunction. For safety, immediately consult a professional mechanic if you notice constant illumination - they can pinpoint the issue within minutes using diagnostic tools.

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BethanyDella
11/08/2025, 03:41:07 AM

The BYD S7's brake light staying on is commonly caused by a faulty pedal switch. The small white switch's contacts oxidize over time, keeping the circuit closed even when the pedal is released. The check method is simple: after turning off the engine, have someone press the brake pedal while you observe if the switch extends and retracts smoothly. If the switch is fine, inspect the trunk wiring harness, especially the section passing through the trunk hinge, as repeated bending can cause wire breaks. Vehicles with aftermarket reverse cameras are particularly prone to this issue. I remember once encountering this situation late at night—I had to temporarily remove the brake light fuse to drive to the repair shop, but this makeshift solution dangerously disables the brake warning function.

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DaniellaRose
12/29/2025, 10:37:53 PM

When it comes to brake lights staying on, there are a few key points to check first. The brake light switch is located on the pedal bracket, and you can see it by lifting the driver's side carpet. Try flipping it back and forth a few times to see if it resets. For wiring issues, focus on the left side of the trunk where the wiring harness passes by metal edges, which can easily wear through and cause a short circuit. Someone in my car group fixed it by wrapping the worn area with electrical tape. Another rare cause is a bug in the body control module, which requires a trip to the dealership to reprogram. The most annoying part of this problem is battery drain—once I forgot to deal with it and couldn't start the car the next day. It's best to address it immediately when discovered, and older cars with modified wiring should be especially cautious about aging wiring issues.

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ChristopherAnn
03/27/2026, 12:56:31 AM

I have personal experience dealing with constantly lit brake lights. The main suspect is usually the brake switch, located behind the brake pedal linkage. This small part costing just tens of RMB can cause the lights to stay on. When inspecting it yourself, don't just look at the switch - make sure the pedal has sufficient return travel. Overly thick floor mats can interfere with pedal movement. Focus your wiring inspection on two key areas: the F22 fuse in the fuse box and the wiring harness leading to the tail lights. Last time, my cousin's car had a wiring issue where cargo in the trunk had damaged the harness insulation. Leaving this unrepaired not only drains the battery and burns out bulbs, but also misleads following drivers. For safety, it's best to go directly to a 4S shop - they have specialized tools to quickly test the switch signal status.

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