![]() ![]() ![]() But they have their uniqueness which makes them different from each other. Alternatively, brake fluid is used in the car’s brake system.īoth fluids are essential for a vehicle’s overall performance. So, what exactly are they? In short, transmission fluid is used in a car’s transmission to lubricate the gears and keep them moving smoothly. brake fluid appears to mind clarifying the distinctions between them. Thus, the topic of transmission fluid vs. People often get confused by considering them the same. Hence, transmission and brake fluids are the two most essential fluids used in a car. When there is corrosion, it is a sign that the brake fluid’s anti-corrosion additives are depleted.Keeping the correct fluids at their appropriate level is a great idea to maintain a vehicle’s performance. The more copper that is present, the chances are the greater that corrosion is occurring in the system. Copper can be a problem for ABS and some valving but it is an indicator of the state of the brake fluid. The increased pH causes copper, which comes from the copper brazing in the walls of the hard brake lines, to become suspended in the fluid. When the brake fluid additives degrade, the surfaces of the brake lines are first to start corroding. This fluid type has an improved additive package so that the replacement interval can be extended to three years.Ĭorrosion of the hydraulic components is a concern for OEMs. Some European manufacturers like BMW and Land Rover recommend an extended service life brake fluid. Combined with high water content, the driver could experience brake fade. When this happens, the pH of the fluid can change and the anti-foaming agents can stop working. Additive Packagesĭue to contamination, heat and/or oxidation, additive package chemicals become depleted. ![]() Some very high-end racing synthetic DOT 4 and 5.1 synthetic fluids can provide a better pedal, but it is so small of a difference that only the very, very, very best drivers can feel it. If the viscosity of the brake fluid is changed, it could change the ABS performance and the corrections of the stability control system.Ĭompressibility is also a specification for brake fluid. The kinematics of the fluid is highly dependent on the viscosity. The viscosity of the fluid is critical for the operation of the HCU. The additive package is a mixture of anti-corrosion, anti-foaming and other propriety chemicals that give the fluid the desired performance characteristics for operation in vehicles. The additive package also can control the viscosity and performance. The viscosity of the fluid is also changed by the percentage of water absorbed. The viscosity is controlled by the formulation of the base stock. These small bubbles can alter the performance of the HCU. Cavitation produces tiny bubbles in the fluid. If the brake fluid does not have the correct viscosity or kinematics, the fluid can cavitate when it is forced through the pump or valves. The pressures inside the HCU can exceed 3,000 psi. Most of the changes to brake fluid are to optimize the pumps and valves inside the ABS hydraulic control unit (HCU). Brake systems have seen the addition of ABS, stability control systems and automatic emergency braking. New changes to vehicles have forced manufacturers to introduce low-viscosity formulations for DOT 4 and DOT 5.1 brake fluids.īrake systems are not getting hotter. So, compatible and correct are two different things. In practice, when brake fluids are mixed, the properties can change. In theory, all fresh DOT 3, 4 and 5.1 brake fluids are compatible with each other. ![]()
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