In recognition of many small partners, the most important car maintenance course “Oil + Water” as well as a variety of filters. Because many tutorials are talking in different climatic conditions, using different grades of engine oil, oil filter, replace the air conditioning, air filter and so on. But there are still quite a few owners, on one of the checks is quite negligent, that is, the brake fluid inspection and replacement.
general maintenance, indeed required oil changes, filter and other filters, can guarantee the efficiency of the engine in the intake, the internal lubrication. Some owners also careful to replace the gearbox oil to ensure its efficiency and service life of components. To the brake fluid can often repair the master visual look is adequate capacity will be trouble. However, there is a large but hidden risks.
, commercially available brake fluid, will be substantially different depending on the difference in production processes and raw material requirements, into an alcohol type , synthetic mineral oil-type brake fluid and three categories. A so-called alcohol-based, it is a lower alcohol (ethanol or butanol) deployment by mixing purified castor oil; mineral oil type light diesel oil is refined, fractions after adding thickening agents and other additives. As synthetic, are ethers, alcohols, esters, etc. is added lubrication, anti-oxidation, anti-rust, anti-swelling additives made of rubber.
Other classification, it is in accordance with the American Petroleum Institute regulations It will be divided into DOT3, DOT4 and DOT5.1 three. It is more common market DOT3 DOT4 ester type and ether type, and the DOT5.1 DOT5 and, one is used for professional racing, or military purposes, the same application in another special purpose, and completely hydrophilic, and of ABS anti-lock system is completely incompatible.
As DOT3 and DOT4 biggest difference is that the dry and wet boilingPoint of difference, according to the brake fluid of the motor vehicle shown GB12981-2003 standard mandatory, DOT3, DOT4 standard two levels corresponding to a boiling point of ≥205 ℃, ≥230 ℃, if the brake fluid boiling point is too low, then the system is easy to vaporize caused by air resistance, causing the vehicle to brake slowly and even brake failure.
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Brake oil , using its uncompressed character, the driver’s brake pedal increase the braking force when the master cylinder piston to push forward, the brake fluid pressure in the master cylinder is increased by the tubing into the cylinder of each wheel, pushing up the outer cylinder of the piston to accomplish the transfer foot braking force to the wheel brake, push the brake wheel brakes embodiment.
Since the brake fluid is so important, then select the brake fluid has become the owners must understand the science. First, we must ensure that does not produce vapor lock braking safety when the internal brake pipe filled with steam brake system will produce the opposite effect. Secondly, it is necessary to have good lubricity, to provide lubrication for the piston member and the brake system as the brake wheel cylinder.
Further anti-corrosive, viscosity-temperature and low-temperature fluidity performance is also part of the brake fluid of interest. During braking, the brake system is not low temperature, even brakes can reach 250 ℃. Wherein part of the heat, will be transferred to the brake fluid allowed to rise in the operating temperature. If the long downhill travel time and braked frequently, the operating temperature will be increased.
at such a high temperature environment, need system hydrodynamic good chemical stability. High-temperature environment is very easy material was dissolved, the brake fluid is no exception, and the thermal decomposition is a problem coincidence fear brake fluid generated at high temperatures, because this will makeBrake fluid viscosity increases, the formation of sludge deposits. When mixed with further need to have different brake fluid, no deposits have miscibility, can not affect the use.
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