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DOT4 brake fluid has a higher boiling point than DOT3, making the fluid less likely to boil. Using cheaper, lower-grade fluid increases the chances of your brakes failing in situations where they build up lots of heat, e.g., driving down a mountain on a twisty road. More information: http://www.carbibles.com/brake_bible_pg2.html


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If the manual is saying small amounts of DOT3 can be used, what they are most likely saying is if you find yourself with low brake fluid and only DOT3 is available, it is better to use that than to not have brake fluid. Once you get back home though you need to get the recommended DOT4 back in the system by bleeding the system and filling with DOT4. As ...


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Most people realize that brakes work by turning kinetic energy into heat. The brake rotors and pads get very hot, this heat is transferred to the brake fluid as well, if the brake fluid gets too hot and boils it effectively puts air in the lines and will lead to brake failure. You can put DOT 4 in place of Dot 3 but not the other way around. Note DOT 5 is ...


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The main difference of DOT3 and DOT4 is boiling point of the fluid. The DOT3 standard has a lower minimum boiling point requirement then DOT4. Not all fluids are made equal and they will all typically list what both their Dry and Wet boiling points are. You can have one DOT3 fluid that just barely makes it past the standard, then another that can handle ...


2

Im useles with computers but please read the whole thing it might help you one day and correct on anything not true. not all sure how much of this is true but info i so far know and go by, dot 4 has a higher boiling point and also has borate esters. dot 5 is silicone based this is the dry boiling point minimum as i know of; dot 3, 205 C (401 F) dot 4, ...


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Check "Brake Fluid" on Wikipedia. DOT 5 is not interchangeable or compatible with DOT 3, 4, and 5.1 fluids and can cause catastrophic system failure. Dot 3, 4, and 5.1 are glycol ether based. They are compatible, but like motor oils, you should use the recommended or higher grade fluid. Dot 4 and 5.1 also have borate ester to handle higher temperatures. ...



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