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What bulb for Ford Focus brake light?


Replacing a brake light bulb is a common maintenance task that every car owner will likely face at some point. If you own a Ford Focus and are wondering which bulb you need for your brake light, this guide will provide you with all the information you need to make the replacement process quick and hassle-free.


Understanding the Brake Light Bulb Type


The Ford Focus typically uses a specific type of bulb for its brake lights, depending on the model year. Most Ford Focus models use a standard 380 bulb (also known as P21/5W), which is a dual-filament bulb. This means it serves two purposes: one filament lights up for the tail light, and the other illuminates when you press the brake pedal.


However, newer Ford Focus models may use LED brake lights instead of traditional halogen bulbs. If your vehicle has LED brake lights, the entire assembly may need to be replaced rather than just the bulb.


How to Confirm the Correct Bulb for Your Ford Focus


To ensure you purchase the correct bulb for your Ford Focus, follow these steps:



  • Check your vehicle's owner manual. The manual will specify the exact bulb type required for your brake lights.

  • Inspect the existing bulb. If you can safely remove the old bulb, look for a part number or type printed on its base.

  • Consult with an auto parts store. Provide your vehicle's make, model, and year to a store representative, and they can help you find the right bulb.


Steps to Replace the Brake Light Bulb


Once you have the correct bulb, replacing it is a straightforward process. Here’s how you can do it:



  • Turn off your car and ensure the brake lights are not powered.

  • Open the trunk and locate the brake light assembly. This is usually accessible from inside the trunk or by removing a panel.

  • Unscrew or unclip the brake light assembly to access the bulb socket.

  • Twist the bulb socket counterclockwise to remove it from the assembly.

  • Pull out the old bulb and insert the new one, ensuring it is securely in place.

  • Reattach the bulb socket to the assembly and secure the assembly back in place.

  • Test the brake lights to ensure the new bulb is functioning correctly.


When to Seek Professional Help


If you’re unsure about the bulb type or feel uncomfortable replacing it yourself, don’t hesitate to visit a trusted auto repair shop. At Kevin’s Autos, we specialize in all types of car maintenance and repairs, including brake light replacements. Our experienced technicians can quickly identify the correct bulb and install it for you, ensuring your vehicle is safe and road-ready.


Remember, functioning brake lights are essential for your safety and the safety of others on the road. Don’t delay replacing a faulty bulb!


Frequently Asked Questions

Can you drive with the brake light out?


Not having brake lights visible comes with penalties, as it's a safety concern. So if you're found to have a brake light out or if it's too dirty to be seen, you could be facing: A verbal warning given by police at the roadside.



How do I know what bulb fits my car?


Every headlight is designated with a bulb size. For a bulb installed in your car, you can find the number stamped or printed on the side of the bulb. It's also listed in the service manual and in an auto bulb guide. Only the correct bulb size will fit in the headlamp housing and connect to the factory wiring.



How do I know what brake light to buy?


Use the information provided in the car manual
It will have different sections to explain the working, maintenance, and specifications of each component. Reading this manual carefully will help you to buy the right kind of brake light bulb that corresponds to the socket.



What brake light bulb do I need for a Ford Focus?


Bosch 566 (P21/4W) Original equipment Car Light Bulbs - 12 V 21/4 W BAZ15d - 2 Bulbs.



Will a 3157 bulb fit a 7443?


No, the 3157 and 7443 bulbs are not interchangeable due to their different base designs and pin alignments.



What light bulb is best for focus?


Warm white or soft white lights in the 2700K-3000K range can help you relax and get a good night's sleep, while cool white lights in the 5000K-6500K range can boost your productivity and focus. And if you want to take your study setup to the next level, consider the BenQ LaptopBar or e-Reading Desk Lamp.



Are brake light and tail light the same bulb?


Tail lights and brake lights are part of one assembly, and many vehicles use the same bulb for both. However, they don't serve the same purpose.



Can I replace a brake light bulb myself?


You don't have to take your car to the mechanic for a brake light replacement. This simple process is one that you can take care of yourself. Not only is a tail light replacement an easy maintenance task, but it's also relatively affordable.



What bulb do I need for brake lights?


Brake lights are available as LED or halogen, usually in P21/5W and P21W fittings. Please check your vehicle handbook or use our Bulb Finder to find out which fitting your car needs - different vehicles use different fittings.



What bulbs does a Ford Focus take?


Ford Focus Hatchback (2015-2018) Bulb Size Chart

Headlights (High Beam and Low Beam)(w/ HID Headlamps)H13 (9008)
Door Mirror Illumination LightT10 (194 168)
Turn Signal Light (Front)7443 (7440) OR BAU15S (7507 PY21W)
Glove Box Light (2016-2018)T10 (194 168)
Parking LightT10 (194 168)


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.