Every trailer, semitrailer, or pole trailer at least 1,500 lbs. and manufactured after July 1, 1975 must be equipped with service brakes on all wheels.
Trailers, semitrailers, house trailers, or pole trailers, manufactured before July 1, 1975 and weighing less than 3,000 lbs. need not have brakes on all wheels.
Every trailer, semitrailer, house trailer, and pole trailer equipped with air or vacuum-actuated brakes and every trailer, semitrailer, house trailer, and pole trailer exceeding 3,000 lbs. and manufactured after July 1, 1969 must be equipped with brakes acting on all wheels, and of such character as to be applied automatically and remain applied for 15 minutes in the event of a breakaway from the towing vehicle.
All trailers weighing more than 3,000 lbs. must be equipped with parking brakes adequate to hold the trailer on any grade on which it is operated, and in all conditions.
Every towing vehicle, when used to tow another vehicle equipped with air-controlled brakes, shall be equipped with 2 means for emergency application of the trailer brakes. One of these means shall apply the brakes automatically in the event of a reduction of the towing vehicle air supply. The other means shall be a manually controlled device for applying and releasing the brakes, readily operable by a person seated in the driver seat.
Every towing vehicle used to tow other vehicles equipped with vacuum brakes shall have a second control device that can be used to operate the brakes on towed vehicles in emergencies. The second control shall be independent of brake air, hydraulic and other pressure, and independent of other controls, unless the braking system is so arranged that failure of the pressure upon which the second control depends will cause the brakes to be applied automatically.