Every motor vehicle and combination of vehicles, at all times and under all conditions of loading, upon application of the service brake, shall be capable of:

(a) Developing a braking force that is not less than the percentage of its gross weight tabulated herein for its classification,

(b) Decelerating to a stop from not more than twenty miles per hour at not less than the feet per second tabulated herein for its classification, and

(c) Stopping from a speed of twenty miles per hour in not more than the distance tabulated herein for its classification, such distance to be measured from the point at which movement of the service brake pedal or controls begins.

Tests for deceleration and stopping distance shall be made on a substantially level (not to exceed plus or minus one per cent grade), dry, smooth, hard surface that is free from loose material.

Classification

of VehiclesBraking force at a percentage of gross vehicle or combination weightDeceleration in feet

per secondBrake System application and braking distance in feet from an initial speed of 20 m.p.h.(A)Passenger vehicles with a seating capacity of ten people or less including driver, not having a manufacturer’s gross vehicle weight rating52.8%1725(B-1)All motorcycles and motor-driven cycles43.5%1430(B-2)Single unit vehicles with a manufacturer’s gross vehicle weight rating of 10,000 pounds or less43.5%1430(C-1)Single unit vehicles with a manufacturer’s gross weight rating of more than 10,000 pounds43.5%1440(C-2)Combination of a two-axle towing vehicle and a trailer with a gross trailer weight of 3,000 pounds or less43.5%1440(C-3)Buses, regardless of the number of axles, not having a manufacturer’s gross weight rating43.5%1440(C-4)All combinations of vehicles in driveaway-towaway operations43.5%1440(D)All other vehicles and combinations of vehicles43.5%1450