#Trailer breakaway manual

The second control is not required by this rule to provide modulated or graduated braking. Such second control shall be independent of brake air, hydraulic, and other pressure, and independent of other controls, unless the braking system be so arranged that failure of the pressure on which the second control depends will cause the towed vehicle brakes to be applied automatically.

#Trailer breakaway manual

Every truck tractor and truck when used for towing other vehicles equipped with vacuum brakes, shall have, in addition to the single control required by § 393.49 to operate all brakes of the combination, a second manual control device which can be used to operate the brakes on the towed vehicles in emergencies. (c) Emergency brake requirements, vacuum brakes. The automatic and manual means required by this section may be, but are not required to be, separate. In no instance may the manual means be so arranged as to permit its use to prevent operation of the automatic means. Its emergency position or method of operation shall be clearly indicated. The other means shall be a manually controlled device readily operable by a person seated in the driving seat. One of these means shall operate automatically in the event of reduction of the towing vehicle air supply to a fixed pressure which shall not be lower than 20 pounds per square inch nor higher than 45 pounds per square inch. Every truck or truck tractor equipped with air brakes, when used for towing other vehicles equipped with air brakes, shall be equipped with two means of activating the emergency features of the trailer brakes. (b) Emergency brake requirements, air brakes.

For air braked towing units, the tractor protection valve or similar device shall operate automatically when the air pressure on the towing vehicle is between 138 kPa and 310 kPa (20 psi and 45 psi). Every motor vehicle, if used to tow a trailer equipped with brakes, shall be equipped with a means for providing that in the case of a breakaway of the trailer, the service brakes on the towing vehicle will be capable of stopping the towing vehicle. § 393.43 Breakaway and emergency braking.