NHTSA campaign 21V720000 · Manufacturer campaign 21PBK
Peterbilt Recall 21V-720: Quick Release Valve Missing/FMVSS 121
NHTSA recall 21V720000 (Manufacturer campaign 21PBK) was reported by PACCAR Incorporated on September 16, 2021, with 15 vehicles potentially affected (per NHTSA). NHTSA's record lists the Peterbilt 520 for model years 2020–2021. Owners were notified on October 7, 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 21V720000 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
- 21V720000 (also written 21V-720 or 21V720)
- Filed by
- PACCAR Incorporated
- Manufacturer campaign number
- 21PBK
- Report received
- Potentially affected
- 15 vehicles (per NHTSA)
- Component
- Service Brakes, Air
- Owners notified
- Safety standard
- FMVSS 121
Repair completion: 80% (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 21V720000. 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.
Peterbilt
All Peterbilt recallsNHTSA's recall notice
As NHTSA's recall record states it for campaign 21V720000.
Defect description
PACCAR Incorporated (PACCAR) is recalling certain 2020-2021 Peterbilt 520 vehicles. The quick release valve on the rear brake signal hose may be missing. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
Safety consequence
A missing quick release valve cannot ensure correct rear brake release timing, increasing the risk of a crash or injury.
Manufacturer remedy
Dealers will inspect the vehicles for a missing quick release valve, and install one if necessary, free of charge. Owner notification letters were mailed on October 7, 2021. Owners may contact PACCAR's customer service at 1-940-591-4220 (Peterbilt). PACCAR's number for this recall is 21PBK.
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 21V720000
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.