Service brakes, air (Peterbilt)
Vehicle recall 21V-720. NHTSA received PACCAR Incorporated’s report on Sep 16, 2021.
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The short answer
NHTSA received PACCAR Incorporated’s report on Sep 16, 2021. Copied from NHTSA on Oct 27, 2026.
Every line below is in NHTSA’s own words, with its source beside it.
What’s wrong with it?
A missing quick release valve cannot ensure correct rear brake release timing, increasing the risk of a crash or injury.
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.”
NHTSA, Recalls flat file. Released Oct 27, 2026. Updated daily.
- NHTSA’s part: Service brakes, air.
What should you do?
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.
NHTSA, Recalls flat file. Released Oct 27, 2026. Updated daily.
- How to reach the firm: 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.
- Check a vehicle by its VIN at NHTSA: the recalls still open on it are listed there.
Which ones are recalled?
NHTSA counts 15 vehicles potentially involved, across everything this recall names.
Each model year opens its own page: every recall naming it, its owner complaints and its crash ratings.
NHTSA, Recalls flat file. Released Oct 27, 2026. Updated daily.
Who is recalling it?
- Made by PACCAR Incorporated.
NHTSA, Recalls flat file. Released Oct 27, 2026. Updated daily.
What the record doesn’t say
- NHTSA’s recall file doesn’t say whether anyone was hurt. Owners’ complaints are counted on each vehicle’s page.
- Whether one vehicle or seat has been fixed: only its maker, or NHTSA’s lookup with a VIN, can say.
- How many have been returned or fixed isn’t in the notice.
Hearth Record wrote these lines.
Sources
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National Highway Traffic Safety Administration, Recalls flat file (FLAT_RCL_POST_2010).
Released Oct 27, 2026 and checked Oct 27, 2026. Updated daily. Public domain (U.S. Government work).
Vehicle, car seat, tire and vehicle equipment recalls, owner complaints and crash ratings are from the National Highway Traffic Safety Administration (NHTSA). Copied on Oct 27, 2026.