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Service bulletins for the 2021 Mack Granite

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.

225 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

Bulletins, newest first
CBR-2016 2024122025-01-02. Service bulletin. SUSPENSION. Frame lean can be caused by several seemingly isolated possibilities. The two most common are suspension and frame assembly issues.
CBR-2014 2024022024-03-05. Service bulletin. SUSPENSION. CBR - Driveline Noise, Suspension Ride Height Too High, Suspension Will Not Exhaust - Chassis Built 2016w01 And Newer.
CBR-2016 2024012024-02-02. Service bulletin. STRUCTURE; SUSPENSION. CBR: Frame Or Cab Lean
M728-005A 2023082023-09-06. Service bulletin. SUSPENSION. TSB: Barksdale Leveling Valve, Leak Test
KC-22922023-07-06. Service bulletin. SUSPENSION. Vehicles Equipped With Chalmers Suspension - Frame Bracket Hardware Loose or Interfering
KC-22532023-03-07. Service bulletin. SUSPENSION. Barksdale Height Control Valve Troubleshooting Guide
KC-22532023-03-06. Service bulletin. SUSPENSION. Barksdale Height Control Valve Troubleshooting Guide
M-852-0012023-01-03. Service bulletin. SUSPENSION. 2007 document reformatted to be published as a TSB in Impact. Lateral cab movement bracket.
M-652-0012022-09-01. Service bulletin. SUSPENSION. 2009 Document reformatted to be published as a TSB in Impact. Axle Alignment Specifications
KC-21702022-06-07. Service bulletin. SUSPENSION. Electronically Controlled Suspension (ECS) Losing Air Pressure
KC-3652022-04-06. Service bulletin. EQUIPMENT; SUSPENSION; EQUIPMENT:MECHANICAL:INTEGRATED JACK/LEVELER/STABILIZER. Mack Chassis - Technical Service Bulletin M-728-005, Leveling Valve, Leak Test, Air Leaks From The Leveling Valve After The Vehicle Is Parked (Shut Off)
S76102021-11-05. Service bulletin. SERVICE BRAKES, AIR; SERVICE BRAKES, AIR:SLACK ADJUSTERS; SUSPENSION:SUBFRAME/MOUNTING BRACKET. Bump Stop Interference with Brake Slack

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.