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Questions tagged [dot4]

Referring to automotive brake fluid. It has a dry boiling point of 230 °C (446 °F) and a wet boiling point of 155 °C (311 °F)

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42 votes
7 answers
641k views

what is the difference between DOT3 and DOT4 brake fluids?

What is the difference between DOT3 and DOT4 brake fluids? What could possibly go wrong if I use a (4 times cheaper) DOT3 brake fluid instead of the DOT4 which manufacturer recommends (but allows ...
ria's user avatar
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10 votes
3 answers
49k views

Using DOT4+ in clutch/brakes when DOT3 is recommended?

Looking at Wikipedia's DOT 3 page, it looks like it's been effectively superseded by DOT 4 fluid, but it's still sold and is still recommended on many forums. This question has an answer saying DOT 4 ...
wjl's user avatar
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