britishtrident
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| posted on 27/1/11 at 03:48 PM |
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DOT 5.1 is a lot more hydroscopic than DOT 4, because of this after a year in the UK climate the boiling point of DOT 5.1 is the same as as year
old DOT 4 after 2 years it is lower than 2 year old DOT4
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RazMan
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| posted on 27/1/11 at 05:27 PM |
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Interesting ..... but surely the hygroscopic properties are academic in a sealed system.
If the DOT5.1 boiling point is 270degC compared with DOT4 at 230degC then assuming the seals are good, I would be very surprised if enough atmospheric
water could be absorbed through the breather hole in the m/c cap to lower the boiling point by 40 degrees.
Still DOT5.1 for me every time - I tend to flush my brakes through every couple of years anyway 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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loggyboy
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| posted on 27/1/11 at 08:47 PM |
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Ive always been told a good quality dot4 is better or as good as 5.1
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mcerd1
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| posted on 28/1/11 at 01:03 AM |
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quote:
Originally posted by loggyboy
Ive always been told a good quality dot4 is better or as good as 5.1
but are they meaning 'super DOT4' like the stuff I'm apparently supposed to use in the focus (and thats just a normal old focus)
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