Brake Lamp Bulb Fault, What To Do?

When the brake lamps malfunction or start to flicker, the notice brake lamp bulb fault appears. It will be brought on by a number of issues that we’ll outline in this quick guide. Have you ever received the error message brake lamp bulb fault? If so, then you shouldn’t worry!

There are others who have experienced this issue besides you. So let’s get started.

Brake Lamp Bulb Fault Causes And Solutions

The primary reasons and solutions for the brake lamp fault warning are discussed in this section.

1. A Defective Brake Light Bulb

When bulbs get old, they typically start to lose their dazzling light, turn dull, and, in most circumstances, eventually burn out.

Therefore, the brake lights would stop shining after the bulbs had reached the end of their useful life or lifespan. Your dashboard will display the Brake Lamp Bulb Fault message to alert you to the issue. This feature was added as a safety measure so that you can correct the flaw before a rear impact accident occurs.


Here, it is intended to replace the damaged bulb with a new one rather than attempt to repair it. To accomplish this, carefully carry out the instructions listed below.

  • First, use a bolt to loosen the case of the faulty bulb.
  • Examine the filament of the bulb in great detail after carefully unplugging it. (The filament is horrible if it has dark smoke or is dark brown.)
  • Replace it by using a spare bulb or a brand-new one you may purchase from an auto shop.
  • Tighten the bulb’s case after carefully closing it. Now you can proceed.

2. A Faulty Brake Switch

When we step on the brakes, our automobiles’ backlights automatically turn on. Near the brake pedal is a device (known as a brake light switch) that detects the pressure of our foot and activates the rear lights. Our ABS (the anti-lock braking system warning light) will come on if this switch is malfunctioning.

When this occurs, pressing the brake pedal won’t cause your rear lights to turn on. It implies that any motorists driving behind you won’t notice you’re slowing down. They won’t slow down, and if they do, you could get hit from behind.


  • If the driver is skilled, he or she can replace the broken brake switch. Otherwise, if someone doesn’t have the fundamental understanding, we won’t recommend that they correct it.
  • Being the most important component of the brake system, any mistake while configuring it can result in a serious hazard.
  • We ought to have the technician fix it.

3. Burst Fuse

A blown fuse is yet another potential explanation for the “Brake Lamp Bulb Fault” notice.

The car’s brake lamp can operate thanks to the fuse. Therefore, the fuse is most likely to blame when there is a problem but not with the brake light switch or the bulb. A bad fuse can cause the lights to flicker or go out entirely.

The power distribution centre, which is typically under the dashboard or under the hood, is where you’ll find the brake light fuse, along with all the other fuses. If “power distribution centre” is a term you are not familiar with, It’s merely the fuse box’s technical term.


Since replacing a faulty or damaged fuse with a new one won’t provide a lasting solution to this problem. Follow these steps to accomplish this:

  • To avoid electric shock, turn off the engine of the car first.
  • Next, locate the fuse for the brake lamp using the owner’s manual for your car.
  • Locate the bad fuse. You would most likely cut the wire of the faulty fuse, which would be dark brown in colour.
  • Simply take out the bad fuse and install a fresh one.
    Wiring Issues

4. Wiring Issues

Faulty wiring is once more a potential source of the “Brake Lamp Bulb Fault” notice. All electrical connections, including those between devices, switches, and sensors, rely on wires. In this instance, wires link the buttons, brake pedals, and fuse to the brake lamps.
Therefore, if a wire is cut, burned, or carelessly attached, it may impair the flow of power, resulting in improper operation of the brake lamps.
The problem could also be brought on by a wire short circuit.


  • There are three ways to repair damaged wiring, and they are as follows:
    If the condition of the damaged wires is not essential, you can either replace them or rewire them using the same cables.
    Cover exposed wiring with tape.
  • Be sure to clean all terminals and tighten any loose connections.

4. Insufficient Brake Fluid In The Master Cylinder

Vehicle hydraulic systems contain master cylinders. It contains a fluid that enables the braking mechanism. It goes by the name of the master brake cylinder as well. When we depress the brake pedal, fluid is sent into the hydraulic system, where it creates pressure and brings the vehicle to a halt. It cannot successfully carry out its function if its fluid level is low.

The brake pedal won’t respond to low brake fluid, and eventually, the brake lamp won’t light up. The master cylinder’s fluid level can be decreased by a leak. In older models of vehicles, it could also fall off after a certain period of time since the brake pads wear out over time. The braking system develops issues as a result of the worn brake pads lowering the liquid level.


By topping off the brake fluid to the proper level, we can resolve this issue. Furthermore, if the brake pad wears out, we should think about replacing it.


You get a “Brake lamp bulb fault” warning message from your car when a problem causes the brake lamp bulbs to go out.

The notice is displayed as a result of incorrect or defective wiring, a malfunctioning brake light switch, insufficient braking fluid, a faulty module, a faulty fuse, or even a broken brake lamp bulb. It’s advisable not to disregard this problem if you’re having it since you might not even be aware of an impending rear collision. Remember to consult your mechanic if you feel unqualified to make any of the aforementioned fixes.

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