[avconsult]

Can also be bad tie rod ends or ball joints that set up oscillation under braking, or something simple as a bit of toe out that causes instability on braking. A good alignment shop can check front end.

Warped rotors will show up as steering wheel back and forth and vibration to a degree at all speeds. It can be truly violent when braking hard at high speeds. Can also cause pulsation in brake pedal and a pulsating tug when rolling to a stop as the pads grip more then less and repeat as rotor turns. You can't check warped rotors visually as a just .005 of an inch out of true can cause significant vibration. .010 is pretty bad.