Braking systems are one of the most important vehicle safety features and therefore need to meet the extremely high standards of car manufacturers, ** and automotive safety legislation. As a result, brake fluids must meet strict specifications and are often officially certified by car manufacturers.
Important Attributes of Brake Fluid:
1.Boiling point
The braking system can never stop the absorption of moisture from the environment. On average, the brake fluid in a car will absorb up to 15% moisture. Due to the increased water content in the brake fluid, its boiling point will decrease accordingly. The frictional heat during braking heats the brake fluid cylinder, which causes the temperature to exceed 150°C. If the temperature of the brake fluid exceeds its boiling point, the vapor bubbles formed in the brake fluid, unlike the liquid, can be compressed, and this failure phenomenon is known as gas resistance. Once the air blockage has occurred, the force exerted on the brake pedal cannot be transmitted to the brake fluid cylinder.
2.Kinematic viscosity
Braking takes only a fraction of a second to occur. The hydraulic force generated by the brake pedal is immediately transmitted to the wheel brakes. Because low-viscosity fluids transfer force more easily than higher-viscosity fluids, it is critical that brake fluids do not become too viscous at low temperatures.
3.Anti-corrosion protection
Corrosion within the braking system can lead to a slower braking response, which can cause blockages in the braking system, or worse, the sealing of the braking system may be destroyed.
4.Lubricating properties
The lubricating effect of brake fluid avoids friction and wear within the braking system, allowing the system to respond continuously, reducing wear and stopping heat build-up within the braking system.
5.Elastomer compatibility
The elastomer bowl is used to seal the brake fluid cylinder to avoid the loss of brake fluid in the gap between the piston and the brake fluid cylinder.
6.High temperature stability
Under extreme operating conditions, brake fluid temperatures can reach more than 150°C. Despite operating in this high heat load, the brake fluid must maintain good chemical and thermal stability.
Brake fluid industry standard:
FMVSS: Federal Motor Vehicle Safety Standard
The FMVSS standard is the minimum requirement for automotive safety in the United States. The requirements for brake fluids in the standard are defined by the DOT classification standard.
fmvss no. 116 dot 3
fmvss no. 116 dot 4
fmvss no.116 dot 5 with silicon.
fmvss no. 116 dot 5.1 Silicone-free.
SAE: Society of Automotive Engineers
SAE International is a leading organization in the research and development of standards for the U.S. transportation industry.
sae j 1703
SAE J 1704 standard.
SAE J 1704 has low viscosity.
ISO: International Organization for Standardization
ISO is committed to harmonizing all kinds of issues related to industry standards around the world, with the ultimate goal of publishing international standards.
iso 4925 class 3
iso 4925 class 4
iso 4925 class 5-1
iso 4925 class 6
GB: Pinyin acronym of the national standard, China's mandatory national standard
National standards are formulated in China by the competent standardization administrative department. The requirements for brake fluids in the standard are defined by the HZY classification standard.
gb 12981-2012 hzy3
gb 12981-2012 hzy4
gb 12981-2012 hzy5
gb 12981-2012 hzy6
JIS: Japanese Industrial Standard
JIS is responsible for setting Japanese industrial standards
jis k 2233 class 3
jis k 2233 class 4
jis k 2233 class 5
jis k 2233 class 6
BASF loves car safety brake fluid.