What is the voltage of car brake lights?
2 Answers
Car brake lights are generally divided into p21w and w21w, while the high-mounted brake lights on cars can generally be categorized as w5w and w16w. Below is an introduction to brake lights: 1. Differences: The main differences between them lie in the bulb diameter and power. Most vehicle models opt for w5w brake lights. 2. Installation: Car brake lights are typically installed at the rear of the vehicle and have strong penetration, ensuring that following vehicles can still detect when the front vehicle is braking under low visibility conditions, thereby preventing rear-end collisions. When the brake pedal is pressed, electrical energy is transmitted to the brake lights, which can be either gas brake lights or LED brake lights. There is also a special type of brake light known as the high-mounted brake light, whose purpose is to alert vehicles approaching from behind. Generally, car models with lower chassis require the installation of high-mounted brake lights.
Having run an auto repair shop for fifteen years, I've encountered countless brake light issues. Typically, passenger cars operate on 12 volts for brake lights, while trucks may use 24 volts—it all depends on the vehicle's battery system design. I always remind car owners that incorrect voltage not only burns out bulbs faster but also poses safety risks, especially in rainy conditions when a non-functional brake light can lead to rear-end collisions due to poor visibility. Regular checks are essential. When replacing bulbs, always verify the voltage; standard sedans require 12V halogen bulbs—never mix up high-voltage ones. DIY testing is straightforward: use a multimeter to check the circuit; a stable working voltage of 13-14V is normal. Replace aging bulbs promptly—LED bulbs are energy-efficient and durable, but avoid illegal ultra-bright modifications. Light maintenance is fundamental upkeep; don't wait for an accident to regret negligence. Safety comes first.
