You must also follow your manufacturer’s recommendations to know whether your braking system is compatible with Dot5 brake fluid. However, it is not compatible with Dot3 or Dot4 liquids and should never be mixed with them. It also has a higher boiling point than the brake fluids Dot3 and Dot4, making it more compatible with excessively aggressive driving. It maintains its integrity and works well. It does not absorb water from the air and is not compatible with ABS systems. Can you mix Dot 5 with Dot 3 and Dot 4?ĭot5 is a silicone-based brake fluid.
If you have Dot 3 in your car from the factory and you know that you are often driving with a trailer or in steep hills, we strongly recommend refilling it with Dot 4 instead. However, if your car has Dot 4 from the factory, it’s not recommended to fill it with Dot 3 the other way around is fine. That’s because both of them are glycol-based brake fluids, which means that they are compatible with each other. Dot 3 and Dot 4 brake fluid can be mixed. They are hygroscopic and absorb water from the atmosphere, which means that care must be taken when storing and regularly replacing potentially contaminated fluids. The Dot 4 brake fluid does have both a higher wet and dry boiling point and is better suited for higher performance.īoth Dot 3 and Dot 4 brake fluids are glycol-based products used in your braking system. The main difference between the Dot 3 and Dot 4 brake fluid is the boiling point.
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