On my 900 I use all 4 and never cover the lever unless I am in town. On the highway you will likely need very little use of them unless you get caught in rush hour traffic, in which case I will cover. The Vulcan 900 though has a hard braking system. Not as touchy as some would like it to be. The bike stops more like a car then most motorcycles. Rear braking even in highway conditions is definitely gonna be needed.