RBF 600 is the best. On my roadrace bike, this stuff made the difference between brakes fading and not. Every other fluid I ran in it (including Motul 5.1) the lever would be coming to the bar in longer races.
DOT 4 is better at holding water in suspension than the 5.1. This is especially beneficial on a dirt bike.
I just put it in the CR last night. I wasn't really having problems, but the rear brake needed bleeding anyway.
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