If a car's braking system fails completely, what should the driver do?

When a car's braking system fails completely, using the handbrake is a crucial step in attempting to bring the vehicle to a stop. The handbrake, or emergency brake, provides a secondary means of slowing down and stopping the vehicle. This system operates independently of the main hydraulic braking system, so in the event of a complete brake failure, engaging the handbrake can help manage the vehicle’s speed and bring it to a halt safely.

It's important to use the handbrake gradually to avoid locking the rear wheels, which could lead to skidding or loss of control. By applying it with caution, the driver can create additional stopping power without jeopardizing stability.

Other methods, such as pumping the brake pedal or turning off the engine, may not be as effective in a severe situation where the brakes have completely failed. Shifting to high gear may also not result in effective deceleration and could lead to engine strain or stalling, further complicating the situation.