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<DIV><FONT size=2>That's a factor of the seals themselves, not whether "you ever
used DOT3" as you wrote. Also you say that your problem was using DOT 3
which rotted the seals. So if anyone else had natural rubber seals and had
used DOT 3, they would have had the same problem and had to replace the seals,
and natural rubber haven't been used since the 50s or 60s. The bottom
line is, if you have used DOT 3 and HAVEN'T had a problem with the seals,
then they are not natural rubber and you can simply replace the fluid with
DOT 4 or DOT 5.1.</FONT></DIV>
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<DIV><FONT size=2>As you say, I doubt whether any natural rubber seals still
exist outside a museum.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>PaulH.</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
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<DIV dir=ltr>I'll respectfully disagree, unless in the 31 years I've owned my
'72B the seal technology has changed. It was well recognized in the 80's and
90's that DOT3 was the kiss of death for British brake seals. Maybe all those
rubber based seals are gone now. When I first bought my B I topped up with
DOT3 and within 2 weeks was re-doing my entire system. My mechanic was eager
to point out the admonishment on the reservoir cap to use Castrol LMA DOT4.
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