Service bulletins for the 2021 Mack MD
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
112 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
Only bulletins with component: Suspension are shown. Show all
| CBR-2016 202412 | 2025-01-02. Service bulletin. SUSPENSION. Frame lean can be caused by several seemingly isolated possibilities. The two most common are suspension and frame assembly issues. |
|---|---|
| CBR-2342 202401 | 2024-02-02. Service bulletin. SUSPENSION. CBR: Mack Medium Duty (MMD) Rear Suspension Bump Stop Bending |
| CBR-2016 202401 | 2024-02-02. Service bulletin. STRUCTURE; SUSPENSION. CBR: Frame Or Cab Lean |
| M728-005A 202308 | 2023-09-06. Service bulletin. SUSPENSION. TSB: Barksdale Leveling Valve, Leak Test |
| KC-2170 | 2022-06-07. Service bulletin. SUSPENSION. Electronically Controlled Suspension (ECS) Losing Air Pressure |
| S7590 | 2021-07-06. Service bulletin. SUSPENSION. MMD - Carrier Bearing Bolt Re-Torque |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.