1) I have been driving around town for a couple of days now in the K5 and forgot to unlock my hubs from using it around here on the ranch in 4wd. Is it hard on the hubs and/or tcase running down the road with them locked? Reason I ask is because I have heard both that it is fine and that it will damage them. 2) On my way home today the brake light in the gas guage came on. I figured I blew a wheel cylinder or a line, or just low on fluid. Checked everything and fluid level is fine and no visual leaks and/or broken lines but I have no back brakes all of a sudden, what would cause that? As always, thanks.