Before that first you must know about the properties of the fluid required to serve as a brake fluid .
- Boiling point- Brake fluid is subjected to very high temperatures Upto 1200 , degrees, so the fluid needs a high boiling point. Also, because our vehicles experience seasons so, it’s important to have low freezing point as well. On top of maintaining both extremes, it's designed not to damage any rubber components in the brake system,especially in the wheel cylinders of drum brakes and disk brake calipers.
- Viscosity should be maintained for a wide range of temperature
- Corrosion resistance -Brake fluids must not corrode the metals used inside components such as calipers, wheel cylinders, master cylinders and ABS control valves. They must also protect against corrosion as moisture enters the system
- Compressibility - Brake fluids must maintain low level of compressibility which remains low even when temperatures and pressure vary.
- Oxidation and Thermal Stability -Braking is the conversion of kinetic energy into heat by friction. The quantities of heat that result are considerable and depend on the weight and speed of the vehicle. Nevertheless , under extreme conditions of operation, brake fluids reach temperatures of more than 150°C. Their cracking phenomenon is a direct measure of their thermal stability. This is determined by the quality of glycol ethers components and the quantity and nature of antioxidants. Antioxidants improve the thermal stability and also hold up the aging of the fluid by oxidation into acidic components.
Water is not able to meet above requirements so we can not use it in place of brake oil in master cylinder.
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