When it comes to the stopping power needed to halt a fully loaded tractor-trailer cruising at highway speeds, both air disc brakes (ADBs) and their S-cam drum brake brethren get the job done. But when it comes to consistently delivering that braking performance, ADBs have an edge; unlike drum brakes, they don’t suffer from a “fade” in stopping power after repeated use. And that edge is becoming more critical as an array of enhanced safety systems (such as a collision ...

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