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NHTSA campaign 21V684000 · Mack campaign SC0429

Mack Recall 21V-684: Brake Pedal Cotter Pin Not Installed Properly

  • Do not drive

Owners are advised not to drive these vehicles until the recall repair is done.

NHTSA recall 21V684000 (Mack campaign SC0429) was reported by Mack Trucks, Inc. on September 1, 2021, with 2,823 vehicles potentially affected (per NHTSA). NHTSA's record lists the Mack MD for model years 2020–2022. Owners were notified on September 13, 2021, per NHTSA.

Updated daily from NHTSA's recall files

Is my vehicle included?

This page lists, by model year, the vehicles NHTSA's recall record names for campaign 21V684000 in the model years try.vin imports (1995 and later); NHTSA's own record can list more. A model year on the list doesn't mean every vehicle of that year is included, and some may already have been repaired.

To see whether a specific vehicle is included and still needs the repair, enter its VIN at nhtsa.gov/recalls.

Free VIN check: decode a VIN to see its year, make and model.

Key facts

NHTSA campaign
21V684000 (also written 21V-684 or 21V684)
Filed by
Mack Trucks, Inc.
Mack campaign number
SC0429
Report received
Potentially affected
2,823 vehicles (per NHTSA)
Component
Service Brakes, Hydraulic — Pedals and Linkages
Owners notified

Repair completion: 98.41% (latest rate the manufacturer reported to NHTSA; dataset updated October 21, 2026)

NHTSA cautions against comparing completion rates across recalls or manufacturers. How try.vin reads them.

Vehicles listed for this recall

NHTSA's recall record lists these vehicles for recall 21V684000. try.vin imports model years 1995 and later, so NHTSA's own list can be longer. Model years with a try.vin recall page link to it. Build dates are NHTSA's range for a model year (per NHTSA); a vehicle built in that range is not necessarily included.

Mack

All Mack recalls

NHTSA's recall notice

As NHTSA's recall record states it for campaign 21V684000.

Defect description

Mack Trucks, Inc. (Mack) is recalling certain 2020-2022 Mack MD vehicles. The cotter pin that retains the brake pedal clevis pin may not have been properly installed, which could result in an unsecured brake pedal.

Safety consequence

An unsecured brake pedal can cause a loss of braking ability and increase the risk of a crash.

Manufacturer remedy

Owners are advised to not drive their vehicles until the remedy has been performed. Dealers will inspect the cotter pin installation and repair it as necessary, free of charge. Owner notification letters were mailed on September 13, 2021. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0429.

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

Sources

Official NHTSA notice for recall 21V684000

Campaign details come from NHTSA's recall files, which try.vin imports once a day. The plain-language subject and the completion rate come from the U.S. Department of Transportation's Recalls Data dataset. How try.vin reads recall data.