DOT 3 VS DOT 4 Brake Fluid: Do They Mix & Which is Best? • Cars Simplified

DOT 3 VS DOT 4 Brake fluid... Do they mix? Is it better to use DOT 4? Steve discusses why people are quick to think that they don't, why DOT 5 doesn't mix, and why it is better to use DOT 4 brake fluid.

What is the best brake fluid and why? Between DOT3 and DOT4, the formulation of DOT4 is meant to deal with higher temperatures before boiling and is compatible with DOT3 systems, so DOT4 is better to use for both performance and life span improvements when used in a DOT3 system.

If you are looking for the absolute best brake fluid in the world, we will have a video in the future about that, but for the time being we will say that in most street driven modern cars, DOT 5.1 is the best, at least when this description was written. DOT 5.1 is designed to be compatible with DOT 3 and DOT 4 systems, but can handle more heat than those fluids. This will reduce the likeliness of brake fade occurring and in systems that are well-sealed, can even have a longer lifespan.

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