When I am braking at high speed or downhill, my steering wheel is shaking badly,
what could be the problem?
We call it brake pulsation, it is caused by out-of-round brake rotor, uneven wear between the
brake pads and rotors. In order to make a smooth braking application, the brake pad and rotor
must conform to one another so that brake pressure is consistent over the contact surface. To fix
this problem, the brake rotor needs to be machined or replaced.