Uneven application of braking power at high speeds, caused by the heat that is made between the rotor and the brake pad; this is causing uneven stresses in the rotor. Such heavy brake usage aggravates the situation by providing uneven wearing along the circumference of the braking surface.
However, other possibilities occur with loose suspension ortire wear; i.e.wheels out of balance.
front end is worn out
Check the front motor mount.
Front brake rotors are warped
Mine had a warped rotor and i had it replaced and it helped
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
you need a front end alignment
Tires/wheels out of balance?
YOUR FRONT ROTORS ARE WARPED. YOU NEED A BRAKE JOB.
Get you front end aligned, that should take care of the shakes.
Your automobile may have a tire out of balance or a worn part in the front end causing this "shimmy" effect .
Sounds like a motor mount or a transmission problem.......
Check all front end components for wear. Then check the engine and transmission mounts as the engine could be shifting and causing the shake.