
Boyue brake fluid model is BASF Hydraulan 404. Introduction to brake fluid: Brake fluid generally refers to hydraulic brake fluid. It is the liquid medium that transmits braking pressure in hydraulic braking systems, used in vehicles equipped with hydraulic braking systems. Brake fluid, also known as hydraulic fluid or force oil, is an indispensable part of the braking system. In the braking system, it acts as a force-transmitting medium. Since liquids are incompressible, the pressure output from the master cylinder is directly transmitted to the wheel cylinders through the brake fluid. Characteristics of qualified and standard-compliant brake fluid: Ensures efficient transmission of braking force under various working conditions such as high temperature, extreme cold, high speed, and humidity; does not corrode metal and non-metal materials in the braking system; effectively lubricates moving parts of the braking system, extending the service life of brake wheel cylinders and seals.

I've been driving the Boyue SUV for five years, and brake fluid selection is crucial. The official Geely manual recommends using DOT4 standard brake fluid, which I've always followed. The brand doesn't matter much—I've tried both Bosch and Shell with similar results. Driving mostly in the city, I need responsive brakes, so I change the fluid every two years and test its moisture content to avoid excessive water absorption, which can corrode the brake system. Last time I replaced it myself, I noticed the old fluid had turned dark, indicating rapid aging. After refilling with fresh fluid, the brakes immediately felt more stable. Safety comes first—delaying replacement increases braking distance and failure risks. I advise owners not to skimp on cheap, low-quality fluid—spending a little extra can save lives.

I've been working in a car repair shop for years and have seen plenty of popular models like the Boyue. The brake fluid must be DOT4—no compromises on the standard—because it remains stable under both high and low temperatures, unlike DOT3 which tends to absorb moisture. Some car owners try to save money by using other types, only to end up with rusted or malfunctioning brake systems that cost more to fix. I recommend using Geely's genuine parts or reliable brands like CASTROL, which have a longer shelf life. When changing the fluid, always check the master and slave cylinders; any trapped air bubbles can affect braking performance. On average, replace it every two years, but if you frequently drive in humid areas, test for moisture content earlier. Don’t attempt DIY fixes—leave it to professional shops for best results.

When I first got my Boyue, I was also curious about what brake fluid to use. The 4S store told me DOT4 would suffice. Checking the manual confirmed this recommendation - it offers balanced performance and safety. I later tried changing it once, buying a local store brand that cost just over ten yuan per bottle. After replacement, the brakes felt slightly softer but I got used to it quickly. No issues during daily commutes, though occasional winter squeaks remind me not to neglect maintenance. The process is simple: stabilize the car, pour new fluid and bleed the old system. Even beginners can attempt this to save some costs.


