Final answer:
Technician A is correct. The parking brake should hold the vehicle on a 30 percent grade in both directions.
Step-by-step explanation:
Technician A says the parking brake should hold the vehicle on a 30 percent grade in both the forward and reverse directions. Technician B says the parking brake must be able to stop a vehicle moving 5 mph within 100 feet. Who is correct?
Technician A is correct. The parking brake is designed to hold the vehicle in place on a slope. A 30 percent grade means that for every 100 units of horizontal distance covered, the elevation increases by 30 units. So, if the parking brake can prevent the vehicle from rolling forward or backward on such a slope, it is functioning properly.
Technician B is referring to the stopping distance of a vehicle's brakes. The distance necessary to stop a car varies greatly depending on road conditions, driver reaction time, and initial speed. However, the parking brake is not designed for emergency stops but rather for keeping the vehicle stationary.