Sorry if thats a dumb question. In my case neither axle has brakes. I have been using this blue crap that says marine from the place I bought the axle. Yesterday was the 4th trip to the lake on a new axle this year....got home after a short hourish drive to and back from the pond and both sides got hot enough to start tossing grease. Arent bearings best packed by hand with a moly base lube. The trailer has some under lying alignment issues I need to deal with....gonna take both axles out...buy new springs...and start from scratch....hoping to limp through summer with what I have. One other question.....when squaring axles up....isnt pretty much the only measurement that is relevant...from the center of the tongue...to the axle(s) and obviously that they(axles) are spaced equal distances apart. I cross measured the back half of my trailer with a friends help....looks as though my trailer is 3/8'' outta square to add insult to injury.