3157 Red Brake Light, Turn Signal LED W/ Built in Resistors No Hyper Flash (PAIR)

3157 Red LED Bulb FAQs

Is a 3157 a brake light bulb?

A 3157 is a dual-filament bulb commonly used for brake lights. These versatile bulbs handle multiple functions – working as both brake lights and turn signals, as well as parking/running lights in some applications. The 3157 design features two brightness levels: a stronger illumination when you hit the brakes and a softer glow for parking/running light mode. This multi-purpose functionality makes the 3157 one of the most widely used automotive bulbs for rear lighting across many different vehicle makes and models.

Will LED bulbs damage my car?

When properly installed, 3157 LED bulbs with built-in resistors won't damage your vehicle. The key is purchasing the right LED lights that fit your specific car. Vehicles with a CANbus system need compatible red LED bulbs to avoid potential issues. Even if your vehicle wasn't initially designed for LEDs, you can safely upgrade as long as you choose quality products from trusted brands like Underground Lighting.

Can I replace incandescent bulbs with LED bulbs in my car?

You can upgrade from factory OEM incandescent bulbs to LEDs throughout your vehicle. The most popular upgrade locations are headlights, rear license plate lights, interior door lights, and especially rear brake lights like our 3157 red brake light bulbs.

Before purchasing, check what bulb type you need – different areas of your car need different bulb designs. Some locations might also need specific tools or parts for proper installation. Once you've identified the right products, you're all set to enjoy the benefits of LED lighting.

What is hyper flash, and what causes hyper flash after installing 3157 LED turn signal bulbs?

Hyper flash happens when your turn signals blink much faster than normal – that rapid blinking that clearly indicates something isn't working properly. Here's what typically causes this problem:

• Bulb Failure: A burnt-out bulb somewhere in the system. Your vehicle detects the reduced electrical load and increases the flash rate as a warning sign.
• LED Conversion: LEDs draw less power than incandescent bulbs, so your vehicle may think a bulb has failed.
• Faulty Flasher Relay: The component controlling your blink rate might be damaged or failing.
• Wiring Problems: Corroded or damaged wires can disrupt the electrical flow to your signals.
• Wrong Bulb Type: Incorrect bulbs that draw the wrong amount of power can cause hyperflash.
• Resistance Changes: Some vehicles use load-sensing systems that detect circuit resistance changes. Modifications can affect this.

The good news? Our 3157 LED brake light bulbs include built-in resistors to prevent hyperflash, giving you a normal blink rate without extra modifications.

Why do I still have hyperflash after installing 3157 LED bulbs with built-in resistors?

The most common reason is a simple oversight during installation. Make sure you start your vehicle and let the engine run before testing your turn signals. Starting the engine activates your vehicle’s Body Control Module (BCM), which allows it to properly detect the resistance in the red LED bulbs.