I topped up the coolant in on my Empulse TT recently and made a video about it. If you need to drain and refill there is only one more step you have to do that is not in this video. If your waterpump sounds like it's getting louder you might want to top off and bleed your cooling system. I can also confirm the coolant in the Empulse TT is the bright green type long life coolant.
This should pretty much be the same for the Brammo Empulse, I think the fuse block is a little different.
Part 1
Part 2
