The major aftermarket-relevant chassis components — brake and suspension systems — that show up across every truck brand, regardless of which OEM badge is on the hood.
Bendix, Meritor, WABCO, Hendrickson
The major suppliers of air disc brake calipers and systems for Class 8 trucks — several systems are cross-compatible in the aftermarket (e.g. Bendix ADB22X calipers cross-reference to Meritor EX225 and WABCO PAN series parts).
Common systems
Bendix ADB22X, Meritor EX225H/EX225L, WABCO PAN17/19/22, Hendrickson MAXX22T
Knowing which brake system your truck actually has (it's stamped on the caliper) matters at parts-counter time — cross-reference charts exist specifically because these systems share enough design lineage to have interchangeable service parts.
Hendrickson, Neway, Reyco, Watson
The major suppliers of air-ride suspension systems that keep a loaded trailer's ride height and damping consistent regardless of load weight.
Common systems
Neway TS-4400/5000/5600, plus Hendrickson and Reyco systems
Peterbilt's SmartAir rear suspension (mentioned on the 579's spec sheet) is an example of an OEM packaging one of these underlying supplier systems under its own brand name — the actual air-spring hardware often traces back to one of these major suppliers.
Many are cross-compatible at the service-parts level — for example, Bendix ADB22X caliper components cross-reference to Meritor EX225 and WABCO PAN-series parts. Always confirm against your specific caliper's part number rather than assuming full interchangeability.
Even when an OEM markets its own suspension name (like Peterbilt's SmartAir), the underlying hardware is frequently sourced from one of the major suppliers — Hendrickson, Neway, Reyco, or Watson. Check the suspension tag itself for the actual manufacturer and model.
Specs reflect common current factory options and can change by model year or region — always confirm exact figures against the manufacturer's current build sheet before making a purchase or maintenance decision.