What is the reason for the Mercedes dashboard displaying 'Check Brake Fluid Level'?
2 Answers
Mercedes-Benz C-Class displaying a 'Check Brake Fluid Level' warning may be due to *insufficient brake fluid in the brake fluid reservoir. The solution is to pay attention to road and traffic conditions, safely stop the vehicle as soon as possible. Do not continue driving. Do not refill brake fluid. Consult a qualified professional service center. The functions of brake fluid are as follows: The characteristics of brake fluid are to ensure flexible transmission of braking force under working conditions such as high temperature, extreme cold, high speed, and humidity; it is non-corrosive to the metal and non-metal materials of the braking system; it can effectively lubricate the moving parts of the braking system, extending the service life of the brake calipers and seals. Precautions when purchasing brake fluid: Check the product's viscosity and color. Brake fluid that is too thin cannot be used, and colorless, transparent fluid cannot be used (generally, qualified brake fluid is light yellow or dark yellow). Qualified brake fluid is noticeably thicker than water, resembling diluted honey, and spreads slowly when poured on a glass plate. Inferior brake fluid has a viscosity as thin as water and spreads quickly when poured on a glass plate. Dipping a finger in it can also reveal a lack of thickness.
I've been driving Mercedes for over twenty years, and the most common reason for the dashboard showing a 'check brake fluid level' warning is simply low brake fluid. This usually happens because the brake pads wear down and consume the fluid, or there's a leak in the system, like aging seals causing fluid loss. Temperature changes can also cause a bit of evaporation. Sometimes, the issue might be a faulty sensor—dust clogging it or a short circuit triggering a false alarm. In rare cases, it could be an electronic module error during self-check. This is not something to ignore; brake failure at high speeds is extremely dangerous! My advice is to pull over immediately, pop the hood, and check the level in the transparent reservoir. If it's below the minimum line, top it up with the manufacturer-recommended brake fluid—no off-brand stuff. If the light stays on after refilling, head to the dealership to check for leaks or replace the sensor. It's not expensive, but safety comes first.
