what would cause a loud hum from rear wheels, gets louder the faster you drive, on 2007 Hyundai Santa Fe

do you have any idea? could it be in brakes, they were replaced 2 months ago.

Asked by for the 2007 Hyundai Santa Fe
This could be several things, possibly something went wrong with the brake work, a worn wheel bearing, a defective tire and if your Santa Fe is 4wd drive, it could be a worn bearing in the rear differential. Either way, go to the shop who performed the brake work and have them re-check their work ASAP.