if it is bearings you should hear it all the time expecially at higher speeds. Unless the sound of your engine is drowning it out. I replaced the wheel bearings on my car and it was quite simple. Plan on going to a hardware store to find socket big enough to remove your hub retainer nut.
It could be the wheel bearing.
it may be a a bad front wheel hub bearing or the brake calliper piston.
that could be a wheel bearing that's gone bad.
You don't
If you suspect something, get them checked. If you get vibration while applying the brakes, get them checked. If you get grinding noise from the brakes, get them checked.
There are no bearings in brakes, but the hub has large ball bearings
I would suspect your brake pads are worn out. The grinding you are hearing is the destruction of your rotors taking place. It is also possible that you may have a defective wheel bearing. Inspect your brake system.
axle bearing or brakes or pinion bearing
Could be, in need of brakes or wheel bearing failure,
The grinding could be coming from the rear brakes.
If your brakes are grinding at all, you need to inspect the brake pads. I suspect you will find your pads are worn out.
it would depend on what kind of humming sound you are referring too. If you are over due on a transmission service or what not it will humm at higher speeds and as you slow down the humming slows with it, or if your brakes have gone bad it will make a humming sound once you hit over 30 mph. it could be a lot of things but those are some options to check out