That makes DOT 5.1 brake fluid compatible with DOT 3 and DOT 4 fluids, but it follows the same rule outlined above — DOT 5.1 fluid can go into a DOT 3 or a DOT 4 system, but you should not put ...

So just how different are the Dot 4 and Dot 4 formulas for brake fluid? Let's take a look at the chemical composition of these components to find out.

When I recently visited a nearby petrol station, they only had DOT4 brake fluid available. What is the difference between the two, and can I use DOT4 in place of DOT3? Mugisha.

That makes DOT 5.1 brake fluid compatible with DOT 3 and DOT 4 fluids, but it follows the same rule outlined above — DOT 5.1 fluid can go into a DOT 3 or a DOT 4 system, but you should not put ...