Bendix Commercial Vehicle Systems LLC said that its air disc brake (ADB) production volumes just 2-million-unit mark as demand for air disc brakes continue to climb in the North American trucking market. The company said that more than 20% of North American Class 6 through Class 8 trucks with air-braked wheel-ends are now equipped with ADBs – a 50% increase in overall market share since 2013.
Bendix and Dana Commercial Vehicle Products LLC jointly produce the Bendix-branded ADB22X ADB for trucks and ADB22-LT for trailers via Bendix Spicer Foundation Brake (BSFB) at Bendix’s wheel-end manufacturing operation in Bowling Green, KY, where it is adding another ADB production line to keep up with demand.
A lightweight design, considerably reduced stopping distance, and extended brake system life are what Bendix considers to be the selling points for its ADB22X family of disc brakes. Bendix ADBs exceed FMVSS-121 stopping distance requirements by 20% and also exceed the federal reduced stopping distance requirements mandated by the National Highway Traffic Safety Administration (NHTSA).
Air disc brakes also enhance safety by providing shorter stopping distances compared to drum brakes, virtually eliminating brake fade, and providing greater reliability with more consistent stops, the supplier said. Brake fade can start to set in on drum brakes during heavy stop-and-go traffic situations or during mountain descents, and can extend stopping distances as drum brakes heat up. Air disc brakes also provide improved brake stability from side to side, reducing the risk of brake steer and providing a car-like feel for straighter, more stable stops, Bendix noted.
Other advantages of the ADB22X are quicker pad replacement and longer pad life, leading to greater uptime and lower maintenance costs. In addition, the ADB22X includes an internal self-adjustment mechanism that can help lower the risk of brakes being found out of adjustment during inspection, which can affect Compliance, Safety, Accountability (CSA) scoring.
The ADB22X and its LT counterpart share replacement wear items, which helps streamline maintenance, training, and inventory requirements. Additionally, the ADB22X-LT offers extended service life via a new adjustment mechanism that improves pad life and reduces brake drag, Bendix noted, along with a new pad (BX276) that offers 8% more wearable volume and up to 40% improvement in wear rate – helping significantly increase uptime and lower operating costs, the company said.
Currently, the Bendix ADB22X is spec’d by six major truck manufacturers, including Peterbilt Motors Co., Kenworth Truck Co., Daimler Trucks North America (DTNA), Mack Trucks, Volvo trucks North American, Navistar’s International trucks. The brake has been standard equipment on the steer axle of all Peterbilt and Kenworth Class 8 tractors since 2013 and in 2017, two OEMs – Navistar and Peterbilt – took a further step forward in North America by making ADBs standard on all wheel-ends for select Class 8 tractors: the International LT Series and Peterbilt’s Model 579.