# NHTSA recall 21V684000

A recall listed here may apply to a vehicle of this year, make and model. Only the manufacturer can say whether it applies to one vehicle: check the VIN with the official lookups.

**NHTSA advises: do not drive until the repair is done.**

- Published by: NHTSA \(United States\)
- Campaign number: 21V684000
- Manufacturer's number: SC0429
- Manufacturer: Mack Trucks, Inc.
- Reported: 2021\-09\-01
- Owners notified: 2021\-09\-13
- Component: SERVICE BRAKES, HYDRAULIC:PEDALS AND LINKAGES
- Units potentially affected: 2823
- Part numbers: 21400412 \- Clevis Pin; 2509281 Cotter pin

## What is wrong

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.


## What can happen

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


## The 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.


## Remedy progress the manufacturer reported

- Report: Annual report 3, for 2025 quarter 3 to 2026 quarter 2
- Filed with NHTSA: 2026\-07\-01
- Vehicles in the campaign: 2823
- Reported remedied: 2778 \(98%\)
- Reported unreachable: 0
- Reported removed: 0

These are the manufacturer's totals for the whole campaign at the end of 2026 quarter 2, as filed with NHTSA. They do not say whether one vehicle has been remedied: check the VIN with the official lookups. The reports are from data as of 2026\-10\-19.

## Vehicles this campaign lists

- [2020 MACK MD](/makes/mack/md/2020/recalls.md)
- [2021 MACK MD](/makes/mack/md/2021/recalls.md)
- [2022 MACK MD](/makes/mack/md/2022/recalls.md)

## Bulletins for the same vehicles and component

A bulletin is the manufacturer's note to its dealers. It is not part of this recall.

- [CBR 407 072025](/bulletins/11021333.md), 2025-08-04, Service bulletin
- [CBR\-407 202409](/bulletins/11008366.md), 2024-10-03, Service bulletin
- [KC\-2140](/bulletins/10227186.md), 2022-12-05, Service bulletin
- [SLM22\-004](/bulletins/10211065.md), 2022-05-06, Service bulletin
- [KC\-361](/bulletins/10207035.md), 2022-02-04, Service bulletin
- [KC\-286](/bulletins/10206158.md), 2022-01-06, Service bulletin

## Check a VIN

- [NHTSA recall lookup by VIN, United States](https://www.nhtsa.gov/recalls)
- [Transport Canada recall search, Canada](https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng)

JSON: [/v1/recalls/nhtsa/21V684000](/v1/recalls/nhtsa/21V684000)

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