1) It would not hurt to check them, but it sounds like you do not have many miles on the unit. I have about 7-10K on our 2012 and have not checked the brakes yet. But it is on my to do list for this spring. I do use a laser thermometer and check the brake temperatures when we stop. If all the temps are about the same, in theory all the brakes are working about the same.
2) I flush mine out in the street in front of my house (no off street parking). Parents does theirs in their yard in its summer parking area. A friend he reserves a full hook up site and does it when he arrives to camp. There are lots of ways and places to flush the unit.
3) I would grease the bearings when you check the brakes. They have easy lub hubs, but I have heard many horror stories of the back seal blowing out and grease getting all over the brakes. So I plan to do a grease job at the same time I check the brakes. I will pull the bearings, clean them and manually grease them.
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