Dot 5.1 - is it better? - BMW Luxury Touring Community
 
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post #1 of 5 Old Apr 25th, 2014, 8:52 pm Thread Starter
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Dot 5.1 - is it better?

I've noticed that you can get dot 5.1 brake fluid and I'm wondering if anyone knows if that's a longer lasting better choice than regular dot 4? Don't confuse dot 5.1 with dot 5 - dot 5.1 is compatible with dot 3 and 4, dot 5 is not.

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post #2 of 5 Old Apr 25th, 2014, 11:33 pm
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Re: Dot 5.1 - is it better?

All it does is buy you the same boiling points as the silicon based DOT 5 fluid in a Polyethylene glycol based fluid. If you feel you need the 356 f wet boiling point over the 311 f of DOT 4 then go for it. Other wise is has all the same other properties of water absorption.

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post #3 of 5 Old Apr 25th, 2014, 11:46 pm Thread Starter
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Re: Dot 5.1 - is it better?

Good info - thanks John!

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post #4 of 5 Old Apr 25th, 2014, 11:58 pm
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Re: Dot 5.1 - is it better?

Higher wet boiling point is the advantage. This pretty much means it will last longer or more forgiving over time but by all means do not extend the servicing intervals just because you use a better fluid. All my vehicles that call for DOT3 or DOT4 gets the DOT5.1 when I flush out the old fluid.

Do Not confuse 5.0 and 5.1. Totally different and not compatible.

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post #5 of 5 Old Apr 26th, 2014, 1:24 am
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Re: Dot 5.1 - is it better?

The prime application for DOT 5.1 is racing where brakes take a beating and cooling is essential; having a higher boiling point has a big advantage there.
I doubt this would be useful for the average driver unless you drive a lot of mountain roads and want to keep brake fading in check.

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