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post #1 of 6 Old 01-06-2013, 03:37 PM Thread Starter
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Brake fluid

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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post #2 of 6 Old 01-06-2013, 04:10 PM
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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.

Chris
1984 F-350 XLT 4x4 4spd. 6.9 (project)
1996 F-250 XLT 4x4 5spd. 7.3
2001 Excursion XLT 4x4 Auto 7.3
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post #3 of 6 Old 01-06-2013, 04:12 PM Thread Starter
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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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post #4 of 6 Old 01-06-2013, 04:13 PM
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I'd only put what the book says. No reason to use DOT4.
I used DOT3 synthetic.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #5 of 6 Old 01-06-2013, 04:27 PM
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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.

Chris
1984 F-350 XLT 4x4 4spd. 6.9 (project)
1996 F-250 XLT 4x4 5spd. 7.3
2001 Excursion XLT 4x4 Auto 7.3
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post #6 of 6 Old 01-06-2013, 04:29 PM Thread Starter
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Thank you very much! I appreciate it


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