What are the characteristics of brake fluid?
3 Answers
Brake fluid is a prerequisite for the braking system and is crucial for braking. The characteristics of brake fluid are as follows: 1. Corrosiveness: Brake fluid has a corrosive effect on the human body, but it must not corrode braking components, such as brake hard lines, brake hoses, and brake wheel cylinders. 2. Stability: Its physical and chemical properties must not change due to long-term storage or exposure to cold or heat, demonstrating strong stability. 3. High boiling point: With a high boiling point, it will not generate bubbles under continuous braking due to high temperatures, which could affect braking performance, such as during prolonged downhill braking. 4. Low freezing point: With a low freezing point, it remains liquid at low temperatures and will not affect fluidity due to cold temperatures. 5. Lubricity: It provides lubrication, reducing wear between the brake piston and rubber, thereby extending the piston's service life.
After driving for so many years, I know the properties of brake fluid are crucial. Simply put, it must withstand high temperatures—when braking, the temperature soars, and if the boiling point is too low, bubbles can form, leading to a spongy brake pedal, which is a life-threatening hazard! I nearly had an accident last time while climbing a mountain, but thankfully I replaced the fluid in time. It also absorbs moisture exceptionally well; over time, too much moisture can cause it to degrade, lowering the boiling point even faster. Generally, it should be replaced every two years for peace of mind. The lubrication system preventing rust is also vital, ensuring responsive braking. A reminder to everyone: choose DOT4-grade fluid—safety first. Regularly check the fluid level; if it turns dark or black, get it serviced immediately—don’t delay.
As a frequent visitor to car maintenance, the key characteristics of brake fluid are its high boiling point, low viscosity, and good moisture absorption capability. A high boiling point ensures no bubbling or failure during braking; low viscosity makes the braking action quick and stable; although moisture absorption can prevent corrosion, too much accumulation requires replacement. I think the difference between DOT3 and DOT4 is significant, with the former having a lower boiling point, suitable for regular driving, while the latter offers higher performance. The replacement cycle is generally every two years or 30,000 kilometers—not expensive but not something to be careless about. Remember to use high-quality brands; don’t skimp and risk problems. Daily maintenance is simple—just open the cap and check the fluid level.
