![]() (3) Transmitting those controlling signals to one or more modulators which adjust brake actuating forces in response to those signals.Īuto transporter means a truck and a trailer designed for use in combination to transport motor vehicles, in that the towing vehicle is designed to carry cargo at a location other than the fifth wheel and to load this cargo only by means of the towed vehicle.Ĭommon diaphragm means a single brake chamber diaphragm which is a component of the parking, emergency, and service brake systems.Ĭontainer chassis trailer means a semitrailer of skeleton construction limited to a bottom frame, one or more axles, specially built and fitted with locking devices for the transport of intermodal shipping containers, so that when the chassis and container are assembled, the units serve the same function as an over the road trailer.ĭirectly controlled wheel means a wheel for which the degree of rotational wheel slip is sensed, either at that wheel or on the axle shaft for that wheel and corresponding signals are transmitted to one or more modulators that adjust the brake actuating forces at that wheel. (2) Transmitting signals regarding the rate of wheel angular rotation to one or more controlling devices which interpret those signals and generate responsive controlling output signals and (1) Sensing the rate of angular rotation of the wheels (f) Any trailer that has an unloaded vehicle weight which is not less than 95 percent of its GVWR andĪgricultural commodity trailer means a trailer that is designed to transport bulk agricultural commodities in off-road harvesting sites and to a processing plant or storage location, as evidenced by skeletal construction that accommodates harvest containers, a maximum length of 28 feet, and an arrangement of air control lines and reservoirs that minimizes damage in field operations.Īir brake system means a system that uses air as a medium for transmitting pressure or force from the driver control to the service brake, including an air-over-hydraulic brake subsystem, but does not include a system that uses compressed air or vacuum only to assist the driver in applying muscular force to hydraulic or mechanical components.Īir-over-hydraulic brake subsystem means a subsystem of the air brake system that uses compressed air to transmit a force from the driver control to a hydraulic brake system to actuate the service brakes.Īntilock brake system or ABS means a portion of a service brake system that automatically controls the degree of rotational wheel slip during braking by: ![]() (e) Any trailer that has a GVWR of more than 120,000 pounds and whose body conforms to that described in the definition of heavy hauler trailer set forth in S4 (d) Any truck that has a speed attainable in 2 miles of not more than 45 mph, an unloaded vehicle weight that is not less than 95 percent of its gross vehicle weight rating (GVWR), and no capacity to carry occupants other than the driver and operating crew (c) Any truck or bus that has a speed attainable in 2 miles of not more than 33 mph (b) Any vehicle equipped with an axle that has a gross axle weight rating (GAWR) of 29,000 pounds or more (a) Any trailer that has a width of more than 102.36 inches with extendable equipment in the fully retracted position and is equipped with two short track axles in a line across the width of the trailer. S3. Application. This standard applies to trucks, buses, and trailers equipped with air brake systems. S2. Purpose. The purpose of this standard is to insure safe braking performance under normal and emergency conditions. S1. Scope. This standard establishes performance and equipment requirements for braking systems on vehicles equipped with air brake systems. That being said, you should always check with the appropriate federal and state agencies to confirm current regulations. Please note, we do our best to ensure that all information published on Trailer Technician is accurate. ![]() Federal Motor Carrier Safety Administration (FMCSA) guidelines for air brake systems. ![]()
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