Brake fluid

[95Strokeee]

I am looking to replace my brake fluid. Can I use DOT 4? Or do I absolutely have to use DOT 3?


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[AMSOILdealer]

Basic difference between DOT 3 and DOT 4 are the minimum boiling points. Dry (freshly opened container) is 401* and 446*. Wet (having absorbed 3% water) 284* and 311*. Synthetic brake fluids resist boil-off and the effects of water contamination more effectively than conventional brake fluids.

[95Strokeee]

So would DOT 4 have a higher boiling point? Is it okay to put DOT 4 in my hog? Thanks for the info


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[jesilvas]

I'd only put what the book says. No reason to use DOT4.
I used DOT3 synthetic.

[AMSOILdealer]

Yes, a higher boiling point and I agree with jeslivas, synthetic DOT3 should be sufficient. If you tow heavy loads regularly DOT4 would offer more protection and I would think it would work with the Harley as well.

[95Strokeee]

Thank you very much! I appreciate it


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