Final answer:
Vehicles typically require two main types of brakes: the primary braking system and a secondary system such as a parking brake.
Step-by-step explanation:
In terms of the number of braking methods required in a vehicle, most vehicles are equipped with two main types of brakes: the primary braking system, typically hydraulic brakes, and a secondary system often referred to as the parking brake or emergency brake. Modern vehicles may also include additional braking technologies such as anti-lock braking systems (ABS) and regenerative braking systems, particularly in hybrid and electric cars.
The effectiveness of the braking system is influenced by several factors, including the distance the driver covers before hitting the brakes, the time it takes the vehicle to stop once the brakes are applied, and the total distance the vehicle covers to come to a complete stop. These factors are impacted by vehicle speed, road conditions, and driver reaction time.