Peterbilt says its new proprietary “FLEX Air” tandem air suspension has the lowest installed weight of any comparable suspension-400 pounds less than Pete’s own Low Air Leaf.
Rated at 38,000 pounds, the suspension uses a weight-efficient structure consisting of a very stiff, lightweight aluminum beam with a small semi-elliptic taper leaf spring mounted at one end, and an air spring at the other end. Aluminum suspension brackets, shock brackets, and extruded air-spring support beams help save weight. Axle-seat weldings have been eliminated to ease axle alignment and pinion-angle adjustments. Rubber bushings at all pivots eliminate the need for lubrication, as well as reduce noise and high-frequency vibration.
FLEX Air is available now on Peterbilt models 379, 387, 385, and 378.
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