| Shazzams post is pretty much spot on. The high spec DOT4's usually come out better than 5.1, but for all round performance vs. cost 5.1 takes some beating. Motul DOT5.1 is my regular service fluid and i use it in all brake and clutch systems. Motul RBF600 has now been superceded by 660 which is pretty much a match for SRF but works out about double the cost of the 5.1
One other characteristic of 5.1 is it's thinner than DOT 4 which can help with bleeding, or so i find anyhow.
DON'T use DOT5....as Larry mentions it's silicon based. It doesn't mix with DOT 4 or 5.1 and plays havoc with the seals in Brembo equipment. |