Mk1 Brake Fluid..

[CaptainSlow]

I'm sure the cap says DOT3, what does everyone recommend?

[MX-5 Lazza]

DOT 4. I'm actually using DOT 5 at the moment but I'll be swapping to DOT 4 next time I change fluid.

[Munter]

MX-5 Lazza said:

I'm actually using DOT 5

I bet you're not.

DOT 4 for me as well. ATE SuperBlue my current poison of choice.

[MX-5 Lazza]

Or am I using 5.1? I can't remember now, I thought it was 5 but I could be wrong. Either way, 4 is best.

[CaptainSlow]

ok great, I guess 1l will be enough for a refresh?

[MX-5 Lazza]

Enough for a few refreshes. Not sure exactly how much it takes in total for a full fluid change but it can't be much more than about 200ml.

[Mazdamender]

This is what i use on my roadsters...

http://cgi.ebay.co.uk/ATE-Super-Blue-Racing-Brake-...

but i keep standard Dot 4 in for owners Mx/roadsters.
M-m

[skinny]

if you're doing a full flush, it takes about 500ml to get all the fresh fluid through.
use DOT4 or DOT5.1

[Oldandslow]

Use 4 or 5.1. DOT 5 is a different chemical formulation and eats the seals (something to do with rubber versus silicone based)

[skinny]

yep once a system has had normal brake fluid in (DOT3, DOT4 and DOT5.1), the rubber seals will fail if subjected to silicon-based fluid (DOT5).

added to which there are no benefits whatsoever from using DOT 5 apart from the fact that it can last 5 years in your car as opposed to 2. DOT5.1 or racing DOT4 are otherwise superior in every way.