What should be noted when changing brake fluid?

[SilasFitz]

When changing brake fluid, the following aspects should be noted: 1. Do not mix impurities into the brake fluid. During the use of brake fluid, gasoline, diesel, engine oil, or windshield washer fluid should not be mixed into the brake fluid, as this will significantly affect braking performance. 2. Do not mix brake fluids of different brands. Different types and brands of brake fluid should not be mixed. For braking systems with special requirements, a specific brand of brake fluid should be used. Since the formulations of brake fluids from different brands and types vary, mixing them can degrade the performance of the brake fluid. Even for brands that are highly compatible and labeled as mixable or substitutable, long-term mixing should be avoided. 3. Before replacement, use protective covers to prevent car components from being corroded by the brake fluid. 4. Ensure that all air is completely purged during the brake fluid change. If air enters the brake system's master cylinder or hydraulic lines, it will reduce the vehicle's braking performance and seriously compromise driving safety. The transfer hose should ideally be transparent and clean to monitor the discharge of old fluid and check for air bubbles.