7 Reasons Why Brake Lights Are Not Working But Tail Lights Are : How To Test & Fixes

brake lights not working

Sometimes brake lights are not working, but tail lights are. Often, vehicles have a common problem. If brake lights are not working in vehicles but tail lights are, there can be different reasons for this. Because the function of a tail light is different from the function of a brake light.

In this post, the brake lights are not working, but the tail lights are. We will discuss its reasons so that you will be able to check these reasons and fix them. Because it is an electrical problem, sometimes more complexity can be encountered in checking the problem.

7 Reasons Why Brake Lights Are Not Working

If your vehicle’s brake lights are not working, there are common causes include a blown brake light fuse, a burned-out brake light bulb, a faulty bulb holder, a faulty brake light switch, and wiring problems.

In this post, we will read in detail about all the reasons for brake lights not working so that you can fix the problem related to brake lights not working in your vehicle.

1. Burned-Out Brake Light Bulb

brake lights bulb fused

Some vehicles have separate bulbs for the brake light and tail light, and in some vehicles, the same double-pointed bulb is used for the brake light and tail light.

That’s why sometimes the bulb of a vehicle’s brake light gets fused, or the point of the brake light gets fused in a double-point bulb, due to which the tail light works properly. But the brake lights don’t work when the brakes are applied.

2. Corrosion In Brake Bulb Holder

You must have seen it sometime. Sometimes, corrosion and carbon accumulate between the brake light bulb and the holder. Due to this, the power supply going through the holder to the brake light bulb stops.

Due to this, the brake light bulb does not illuminate. The reason for the accumulation of corrosion in the brake light holder can be due to water entering the brake light or vapor accumulation in the brake light during rainy days.

3. Wiring Issue

wiring

The main reason for a brake light not working can be damaged or broken wiring or a broken brake light bulb.

Sometimes a light bulb wire may break due to a shock, or the brake light wiring may be damaged due to a short circuit or being gnawed by a small animal.

Due to this, the brake light does not work while braking. But the tail light is working. Therefore, if the brake light does not work, check the wiring.

4. Faulty Brake Light Switch

faulty brake light switch

Often, vehicles are fitted with a brake light switch to operate the brake lights. This brake light switch is connected to the brake pedal of the vehicle. Thereby, whenever the brake pedal is pressed.

Then the brake light switch also depresses and turns on the power supply to the brake lights, due to which the brake light works when the brakes are applied. But sometimes the brake light switch goes bad.

Due to this, the power supply does not reach the bulb of the brake light even when the brake switch is pressed by the brake pedal.

Because of this, the brake light does not work. But the tail light is working. Therefore, if this happens, the brake light switch must be checked.

5. Damaged Ground Connection

Positive and negative currents from the battery are always required for any of the vehicle’s light bulbs to turn on.

Sometimes the main reason for a brake light not working is a damaged or broken negative ground connection. Because the positive current in the brake light bulb comes from the battery through the brake switch.

But to turn on the brake light bulb, the negative ground connection to the battery is damaged. Because of this, the brake light does not work. But the tail light works fine. because the ground connection of the tail light is different.

6. Brake Light Fuse Blown

fuse-blown

Different fuses are provided for all electrical functions in vehicles. All these different fuses are fitted in the fuse box of the vehicle. Fuses are provided from a protective point of view for any electrical function of the vehicle.

which the related fuse blows when any electrical function of the vehicle is damaged or there is a short circuit, causing the power supply to stop. Similarly, sometimes the fuse in the brake light of the vehicle gets blown for some reason.

Due to this, the power supply does not reach the bulb of the brake light in the event of braking. Due to this, the brake light does not work. But the tail light is working properly.

7. Bad Turn Signal Control Assembly

In some vehicles, the brake light power supply is connected to the turn light control assembly and the power supply from the turn light control assembly goes directly to the brake light switch, due to which the brake light turns on when the brake is applied.

But sometimes the turn light control assembly gets damaged. Due to this, the power supply does not reach the brake light switch, and the brake light does not work when the brake pedal of the vehicle is pressed. However, the power supply to the brake lights is provided by the turn light control assembly in some vehicle models.

How To Test & Fix Brake Light Not Working?

To fix this, it is necessary to first investigate the reason why the brake lights are not working. So you can repeat the following process to fix the brake light. such as

  • First, you check the brake light bulb. if the brake light bulb is fused. Then you replace the brake light bulb with a new one.
  • Check the brake light main fuse.
  • Clean the corrosion in the brake light bulb and holder with sandpaper.
  • Next, check the brake light wiring. if the brake light wiring is damaged somewhere. Then you repair it or replace it with a new one.
  • In this process, you will have to check the brake light switch. also replace the bad brake light switch.
  • Reattach the brake light ground connection.
  • Check the turn light control assembly, if this assembly is damaged, you will need to replace it.
  • In this way you can fix the brake light not working.

FAQ’s

Q. How much does it cost to fix brake lights?

The cost of fixing brake lights is cheap. Repairs to the brake light bulb, fuse, and wiring can cost between $20 and $35, including a mechanic’s labor.

Q. Can you legally drive with your brake lights out?

It is illegal to drive a vehicle when the brake lights are not working, and driving skills are not recommended to drive the vehicle with the brake lights off. Because it can cause an accident for you and for others.

Q. Should You Change Both Brake Lights at the Same Time?

If you are changing a single brake light bulb, then consider replacing the other brake light bulb at the same time. Because the age and lifetime of both the bulbs of brake lights are the same. because it is not a matter of high cost.

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