Maybe bearing problem.

[nissannewby]

first, since you have made no mention of weird noises I can assume it is not ur bearings, failing bearings have a distinct noise, second its not your handbrake, the handbrake is not connected to your rear brakes as in conventional cars, it is connected to the rear of the gearbox,

Good stuff morton. I clearly wasnt thinking about the handbrake and its non relation to the rear wheels must have had a brain fart. As everyone else has stated check your calipers/drums to make sure they are releasing. You are always gonna have some heat transfer through it anyway with normal driving but if its unable to be touched (cannot hold hand on it) then you may have an issue.