[Miata] Brake fluid change

[CHRISTOPHER ADAMS]

I used to have a MGB back when I was too young, dumb and poor to be able to properly maintain the thing. One of the things that puzzled me then and now, is why they have continued with the natural rubber seals and not just produced them in modern more resilient compounds? 

>>> "Keith Tanner" <keith at miata.net> 1/24/2007 11:21 AM >>>
Other than the "safe for fragile british seals" aspect, I don't see
the advantage of LMA for a car that sees spirited driving. The dry
boiling point is pretty low and the wet is the minimum required by law
for a DOT4 rating.

Waterlogged Motul Racing is much more effective than fresh LMA but
about 2.5 times more expensive.
ATE Super Blue is the same price but has much higher dry points and
not all that much difference in wet.

I've always wondered why the British seals are so badly affected by
some brake fluids. I think it's because they're made of natural
rubber, but I'm not sure. Would it not make sense to use seals that
are not fluid-sensitive? I have a hard time believing there's any
performance advantage to the British stuff over everything used in the
rest of the world.

My old Land Rover gets the cheap DOT4 fluid from Canadian Tire. It's
not LMA, but it's apparently safe for crappy British rubber and it was
easy to get when I lived in Canada.

Keith
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