wheel bearing play should be between 0.01-0.02mm (half to one thou. the needle barely moves) sometimes they need adjustment but if it's only slightly out of spec it shouldn't cause a rumble

put a dial indicator on the rotors and check them. Can't have more than 0.12mm (5 thousands of an inch) of runout. If you have more than that then check the hub with a similar method to check if it's not bent or something

Can also be worn suspension