The plane which is defined by the head-to-foot and anterior-to-posterior directions in the human body. A stack of images acquired in the sagittal plane separates images by their left-to-right locations. The mid-line sagittal plane bisects the left and right half of the human body.
Under heavy braking, the rear tires lock up and the axle begins to bounce; the amplitude of the bounce becomes so severe that the tires finally develop enough traction (when slamming hard against the pavement) to rip the whole axle assembly free of the vehicle.
Loose or unbalanced steering dampers are another common culprit. If the shaking occurs during braking, though, then the problem could be a warped brake rotor. If this is the case, the steering wheel shakes as the car slows. These problems require a mechanic to repair them.