What type of brake fluid does the BMW 5 Series use?
2 Answers
The BMW 5 Series uses DOT4 brake fluid. Introduction to BMW brake fluid: For the BMW 5 Series, it is recommended to replace the brake fluid every 2 years, although this interval may vary depending on usage conditions. Brake fluid is somewhat corrosive and highly hygroscopic. Many service centers now have specialized tools to measure the water content in brake fluid, allowing for testing to determine if replacement is necessary. It is essential to replace brake fluid regularly according to the maintenance schedule, preferably adhering to the maintenance cycle specified by the BMW 5 Series manufacturer. The brake fluid specification for the BMW 5 Series is: DOT4. Purpose of BMW 5 Series brake fluid: Brake fluid, also known as automotive brake fluid, was initially used in early vehicles with mechanical drum brakes. With the advancement of hydraulic technology, safe and reliable hydraulic braking systems have become widely used in automobiles. Automotive brake fluid is the liquid used in the hydraulic braking system of a vehicle. When the driver presses the brake pedal, the force applied is transmitted by the piston in the master cylinder through the brake fluid to the wheel cylinders, causing the brake pads to expand and stop the vehicle. When the brake is released, return springs pull the brake pads back to their original position. Throughout this process, brake fluid serves the function of transmitting force.
I've been driving a BMW 5 Series for over five years, and brake fluid is a crucial aspect of maintenance. The BMW official manual typically specifies the use of DOT 4 brake fluid, with high-performance models or new cars often recommending DOT 4 LV due to its higher boiling point, which prevents vapor lock failure during braking. The braking system relies on this fluid to transmit pressure. If it absorbs too much water or deteriorates over time, the brakes may feel spongy or even become dangerous. I change it every two years, either at a dealership or a professional service center, to ensure the fluid meets BMW specifications. Don't cut corners with substandard products—safety comes first. Regularly check the brake fluid level while driving, and if you notice slower brake response, get it inspected immediately. These small steps can prevent major issues.
