Does the steering wheel shake worse when you step on the brakes? If braking does not cause the steering wheel shaking you probably just have an out of balance wheel, a bent rim or a faulty tire.
Your front brake rotors need to be machined or replaced.
You need the front rotors machined or replaced.
Warped rotors
You probably have warped brake rotors. You'll need to have them replaced or resurfaced.
you need to have your brake rotors turned or even replaced, this is a 200.00 fix or so
You probably have rusty/scored brake rotors.
Warped brake rotor. Have the rotors removed and trued or replaced. Replace the brake pads at the same time.
Your brake rotors are warped.
Your rotors are warped. You need new brake pads and the rotors turned at a machine shop or replaced.
Rotors out of round - need to be re-surfaced or replaced
i think your rotars need to be cut
depends on when it shakes if it shakes when you put on the brakes-warped rotors otherwise it could be ball joints, steering joints, wheel bearings or even out of balance tires