This compatibility is because DOT three and four fluids do not contain solvents. Yes, DOT three and DOT four brake fluid are compatible, and you will notice that DOT four fluid will have a little higher boiling point than DOT 3. Are DOT 3 And DOT 4 Brake Fluid Compatible? Therefore, any rust would only happen if you applied enough pressure for your car’s brake fluid to boil, which occurs when you go downhill too fast or apply the brakes hard. This myth is unfounded, and the mechanism behind brake action is the difference in air pressure. Brake fluids also contain anti-corrosive chemicals that keep metal parts in the braking system in good shape.Ĭommon myths regarding brake fluids are applying too much pressure on brakes can cause rust on brake drums. They tend to stay liquid even long after their manufacturers recommend changing the brake fluid. Common brake fluids are formulated to resist high temperatures, so they won’t turn into liquid sludge. You will find many famous brands such as Castrol, Prestone, Bosch producing some of the best brake fluid.īrake fluid is a chemical mixture of many additives that ensures that your car’s brakes function correctly. In addition, DOT 3 is relatively cheap compared to other types of fluids available in the market. In most cases, they are also compatible with Silicon antifreeze systems and are used in various industries, including aircraft, cars, and other vehicles where brake fluid is required. These fluids work well with aluminum, copper, steel, and iron-based wheels, but they are not designed for use in vehicles that have ABS. This helps stop the pads from friction-welding together when they contact the brake disks. The fluid is also hygroscopic, meaning it attracts moisture. This type of fluid is metallic-based, which means that it has copper particles suspended in it to help improve braking performance by acting as a lubricant between the metal piston surfaces. Must read Clunking Noise When Braking: 5 Causes And Solutions DOT 3 Brake Fluid In addition to this, DOT 4 brake fluid will work with any wheel or tire combination and doesn’t require corrosion inhibitors added to its composition. The substance also offers lower viscosity levels, which means it can flow more easily and doesn’t leave a deposit on the piston surfaces when it comes into contact with them.Īlso, several additives are added to the DOT 4 fluid, which allows for a much faster release of moisture in the system. This oil-based compound is used in all modern vehicles and is compatible with ABS and silicon antifreeze systems. The difference between these two types of fluids is the freezing point.Ī fluid with a lower freezing point will be designated as DOT 3, whereas a fluid with a higher freezing point will be designated as DOT 4.ĭOT 3 VS DOT 4 Brake Fluid: Do They Mix & Which is Best? DOT 4 Brake FluidĭOT 4 brake fluids were designed to reduce the number of parts used in braking systems. Generally speaking, most automatic transmission fluids belong to one of two categories: DOT 3 or DOT 4. Tell Me The Difference Between DOT 3 And DOT 4 Brake Fluid? Are DOT 3 And DOT 4 Brake Fluid Compatible?.Tell Me The Difference Between DOT 3 And DOT 4 Brake Fluid?.Motor oils vary greatly between manufacturers and types of vehicles based on their intended use and compatibility requirements. However, certain vehicles require more caution in mixing different fluids due to incompatibility issues that may arise for example, mixing antifreeze with gasoline would create vapors that could explode, which could cause serious injury or property damage. In general, when it comes to auto fluids such as brake fluid or motor oil, they can be mixed with no harm done to either fluid. However, to answer this question, one must consider whether or not you should mix DOT 3 and DOT 4. This means that it is essential to have quality brake fluids in your vehicle at all times, so it doesn’t break down or need replacing sooner than necessary.įor those who are not in the business of car repair, this question is likely not top-of-mind. It acts as a carrier for moisture, which helps stop the brake pads from dragging over the rotors, causing wear. However, deciding the fluid can be challenging and confusing if you do not know it.īrake fluid is one of the essential parts of your car’s braking system. Yes, you can mix DOT three and DOT four brake fluids without worrying.
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