Sounds as if you have had your left front brake caliper seize up on you. If you are a DIY'er, jack up the front of your car using a pair of jack stands and remove the two front wheels. Set your emergency brake and use wheel chocks to prevent your car from rolling. With the transmission in neutral, stick a large flat-headed screwdriver into the slots on your (left) rotor and try to make it turn. If it does not move freely, you have identified the problem.
You will most likely need to replace your front pads and either resurface/replace your rotors. Don't worry, it is easier than it sounds. :)
P.S. - Don't forget to bleed your brakes. Also, you might want to flush/replace your brake fluid at this time.
Could be the carrier bearings or pinion bearings in the differential(s). Mine was the wife and kids.
It could be brakes, bearings or something else altogether.
There could be a number of causes. If the car is making the sound whilst stationary it could be a slipping fanbelt, or could be a problem with bearings. Water pump bearings are a common cause of such noise. If the noise is occurring only whilst travelling. It could be wheel bearings or rubbing brakes.
Wheel Bearings are most likely worn.
Could be something caught in your brakes, but it could also be something more serious. You or your mechanic should check it out soon. It could be the bearing failing, and that wouldn't be good to have it fail at 60+ MPH. Or your wheel bearings are going out.
Rattling under the hood can be something easy to fix to something bad. It could be loose bolts, bearings, pulleys, or it could be interior in the motor.
It's hard to diagnose without hearing the noise, but if you're sure that it is not the brakes, it could be dirt/sand/rock in the brakes. If you're hearing the sound all the time (even when not applying the brakes), it could be wheel bearings.
The cause of the front tire leaning out comes from needing new ball bearings. It could also mean you need wheel bearings.
Warped rotors or drums and also have the front end checked as well as bearings. Warped rotors being number one, if it's in the steering wheel. If it's more in the seat concentrate on the rear brakes system.
bad bearings, lack of oil
Normal wear on the bearings inside.
bearings