Humming noise in the front end

posible you need wheel bearings

Sounds like a wheel bearing .

Have the wheel bearings been checked?

could be wheel bearings

Sounds like a front hub bearing. Did you tell the shop about the noise? They should be able to locate and repair it for you.

if only starts around 25 mph. and not at like 15 or 20 then one of the rotors are warped but if it is
their at 15 to 20 then its a wheel bearing

warp rotors tend to make noise at low or high speeds depending on the degree or how badly warped they are, if the brake pedal kick back when you apply the brake then you will have to get new rotors installed

SOUNDS LIKE WORP ROTORS I REPLACE ROTOR AND BRAKE PADS SEE IF THAT HELP AND CHECK WORN PARS IN FRONT END LIKE TIE RODS

could be the CV axle or the hub bearing

I'm having the same problem with my 2006 Chevy 2500 duramax...The humming starts at 25mph and then gets less prominent and then at 50mph it gets more prominent and louder, then at 60mph you can hardly hear it.....I did notice a little bit of leakage where the front axel meets the from diff on the drivers side.
Any suggestions?