How should you brake when driving a vehicle with disc brakes on ice?

When driving a vehicle equipped with disc brakes on icy surfaces, employing a slow, intermittent braking action—fully on and then fully off—is essential for maintaining control. This technique allows the driver to modulate the brake pressure without locking the wheels, which can happen if brakes are applied too hard. On ice, a vehicle can easily skid if wheels lock, leading to a loss of traction and control.

By alternating between applying and releasing the brakes, the driver can make use of the inherent friction provided by the disc brakes while minimizing the risk of slipping. This gentle approach helps to maintain traction, allowing the driver to steer while braking. It’s crucial to adapt braking techniques to the conditions, especially in icy situations, where smooth, controlled actions are necessary for safety.

The other choices involve methods that could lead to losing control of the vehicle. For instance, using steady pressure without releasing might lead to locking the wheels, while braking hard could cause skidding and prevent steering control. Only braking when necessary could mean missing the opportunity to slow down safely and might not account for sudden hazards that can arise on icy roads.