PACCAR issued a recall on the T660T700,T800, and W900 models

On certain vehicles equipped with the AG400L suspension and air disc brakes, a caliper could be installed on the wrong side of the drive axle. This could cause interference with the suspension bracket and U-bolts as the outermost brake pads wear and the floating caliper moves inboard. As this interference gets larger, it prohibits the movement of the floating caliper, subsequently reducing the outer pad's pressure on the disc which can eventually lead to reduced braking performance and increasing the risk of a crash. Correction: Dealers will inspect and, if necessary, replace one drive axle brake caliper.