How To Replace Third Brake Light
Replacing your third brake light, sometimes called the center high mount stop lamp (CHMSL), might seem daunting, but it's often a straightforward repair you can tackle yourself. This guide provides clear, step-by-step instructions and helpful tips to ensure a successful replacement.
Why Replacing Your Third Brake Light Matters
A functioning third brake light is critical for safety. While your two primary brake lights alert drivers behind you that you're slowing down, the third brake light, positioned higher and in the center, offers several advantages:
- Improved Visibility: Its elevated position makes it more visible, especially in heavy traffic or poor weather conditions.
- Reduced Rear-End Collisions: Studies have shown that vehicles equipped with a functioning third brake light are less likely to be involved in rear-end collisions.
- Enhanced Alertness: It provides an additional visual cue, helping drivers react quicker and avoid accidents.
- Legal Requirement: In many jurisdictions, a functioning third brake light is legally required. A non-functioning light could result in a ticket or fail a vehicle inspection.
Ignoring a broken or malfunctioning third brake light not only increases the risk of an accident but can also lead to legal repercussions. It's a relatively inexpensive and easy repair that can significantly improve your safety on the road.
How to Choose the Right Replacement Third Brake Light
Selecting the correct replacement third brake light is essential for a proper fit and functionality. Here's what to consider:
1. Vehicle Make, Model, and Year
This is the most crucial factor. Different vehicles have different third brake light designs and specifications. Ensure the replacement light is specifically designed for your exact vehicle make, model, and year. Consult your owner's manual or a parts retailer (online or in-person) to confirm compatibility.
2. Bulb Type and Wattage
If only the bulb is burnt out (and the lens assembly is intact), identify the correct bulb type and wattage. This information is typically found in your owner's manual or stamped on the bulb itself. Using the wrong wattage can lead to overheating or a blown fuse. If you're replacing the entire assembly, it will usually come with the correct bulb pre-installed, but verify this before purchasing.
3. Lens Type and Color
Ensure the replacement lens matches the original in terms of color (usually red) and transparency. While aftermarket options might offer different lens styles (e.g., smoked or clear), these may not be legal in all jurisdictions. Stick to the original lens type for optimal safety and compliance.
4. LED vs. Incandescent
Some vehicles come with incandescent bulbs, while others use LEDs. LEDs are generally more durable and energy-efficient than incandescent bulbs. If your vehicle originally had an incandescent bulb, you might be able to upgrade to an LED replacement (if available and compatible). However, ensure the LED replacement is specifically designed for automotive use and has the correct resistance to prevent error codes or hyper-flashing.
5. Quality and Brand
While it's tempting to opt for the cheapest option, investing in a quality replacement from a reputable brand is generally a wise choice. Higher-quality lights are typically more durable, reliable, and offer better light output. Consider brands known for their automotive lighting products.
6. Complete Assembly vs. Bulb Only
Decide whether you need to replace the entire assembly or just the bulb. If the lens is cracked, damaged, or faded, replacing the entire assembly is recommended. If only the bulb is burnt out and the lens is in good condition, replacing just the bulb is sufficient.
7. Check for DOT Compliance
Look for the "DOT" (Department of Transportation) marking on the replacement light. This indicates that it meets federal safety standards.
Steps to Replace Your Third Brake Light
Here's a general guide to replacing your third brake light. Always consult your vehicle's repair manual for specific instructions.
Tools and Materials Needed:
- New third brake light assembly or bulb
- Screwdriver (Phillips or flathead, depending on the vehicle)
- Socket set (if necessary)
- Pliers (if necessary)
- Gloves
- Safety glasses
- Optional: Multimeter (to test the bulb socket)
Step-by-Step Instructions:
- Safety First: Park your vehicle on a level surface, turn off the engine, and engage the parking brake. Disconnect the negative terminal of the battery to prevent electrical shocks.
- Locate the Third Brake Light: The third brake light is usually located on the rear deck, inside the rear window, or on the liftgate/hatchback.
- Access the Light Assembly: How you access the assembly will vary depending on the vehicle. Some lights are accessible from inside the trunk or cabin, while others require removing trim panels. Refer to your vehicle's repair manual for specific instructions. This often involves carefully prying off plastic covers or unscrewing retaining screws. Be gentle to avoid breaking any clips or panels.
- Remove the Old Light Assembly: Once you have access, disconnect the electrical connector from the light assembly. This connector usually has a clip or latch that needs to be released. Then, remove the screws or clips holding the light assembly in place.
- Replace the Bulb (If Applicable): If you're only replacing the bulb, carefully remove the old bulb from the socket and insert the new bulb. Ensure the new bulb is securely seated.
- Install the New Light Assembly: Connect the electrical connector to the new light assembly. Then, align the assembly with the mounting holes and secure it with the screws or clips.
- Test the Light: Reconnect the negative terminal of the battery. Turn on the ignition and have someone press the brake pedal while you check that the third brake light is working. If it doesn't work, double-check the electrical connection and bulb installation. If the bulb is new, use a multimeter to ensure the socket is receiving power.
- Reassemble: Reinstall any trim panels or covers that you removed to access the light assembly.
- Final Check: Double-check that all panels are securely in place and that the third brake light is functioning properly.
Real-World Owner Experiences
Many vehicle owners have successfully replaced their third brake lights themselves, saving money on labor costs. Here are a few common experiences:
- Difficulty Removing Trim Panels: This is a common challenge. Using the correct tools (plastic pry bars) and being patient can help prevent damage to the panels.
- Electrical Connector Issues: Sometimes, the electrical connectors can be corroded or difficult to disconnect. Using a small amount of electrical contact cleaner can help.
- Finding the Correct Bulb: Make sure you have the right bulb before starting the project. Check the owner's manual or consult a parts retailer.
- Success Stories: Many owners report that the replacement is a simple and straightforward process that can be completed in under an hour.
Frequently Asked Questions (FAQs)
Q: How much does it cost to replace a third brake light?
The cost varies depending on the vehicle and whether you replace the bulb only or the entire assembly. A replacement bulb typically costs between $5 and $20, while a complete assembly can range from $20 to $100 or more. Labor costs at a repair shop can add another $50 to $150.
Q: Can I drive with a broken third brake light?
While you can technically drive with a broken third brake light, it's not recommended. It's a safety hazard and may be illegal in your jurisdiction. It's best to replace it as soon as possible.
Q: What if my third brake light is an LED and it's not working?
If your third brake light is an LED and it's not working, it's likely that the entire assembly needs to be replaced. Unlike incandescent bulbs, LEDs are usually integrated into the assembly and cannot be replaced individually.
Q: How do I know if it's just the bulb or the entire assembly that needs to be replaced?
If the lens is cracked or damaged, or if the light is not working even after replacing the bulb, it's likely that the entire assembly needs to be replaced. If the lens is in good condition and the bulb is burnt out, replacing just the bulb may be sufficient.
Q: Where can I buy a replacement third brake light?
You can purchase replacement third brake lights from auto parts stores, online retailers, and dealerships.
Replacing your third brake light is a crucial safety measure that you can often handle yourself. By following these guidelines, you can ensure a successful and safe repair, keeping you and other drivers safe on the road. Remember to always prioritize safety and consult your vehicle's repair manual for specific instructions.
