If you have to come to a stop on an icy road and your car is not equipped with ABS brakes, you should:

When you need to stop on an icy road and your vehicle is not equipped with Anti-lock Braking System (ABS) brakes, pumping the brake pedal lightly is the best technique to maintain control of the vehicle. This method allows you to apply the brakes in a way that helps prevent the wheels from locking up, which can occur if you apply the brakes too hard. When wheels lock up on ice, the vehicle may skid and lose traction, making it harder to steer and control.

By pumping the brakes, you're able to modulate the pressure applied, giving the tires a chance to maintain some level of grip on the slippery surface. This technique not only helps in slowing down the vehicle more safely but also preserves your ability to steer, enabling you to navigate around obstacles if necessary.

In contrast, using the parking brake can lead to loss of control, putting further stress on the wheels, especially since it is designed primarily for stationary use rather than slowing down from speed. Applying the brakes hard or using short, hard jabs would likely result in locking the wheels, creating a skid, which is particularly dangerous on icy surfaces.