PETERBILT 520 (2020) recall — Service Brakes, Air
PACCAR recalls 2020-2021 Peterbilt 520 trucks with missing quick release valves that could cause brake failure and crashes.
Use caution until it’s fixed
A missing quick release valve cannot ensure correct rear brake release timing, increasing the risk of a crash or injury.
Contact the company & request your remedy
What happened, in plain English
PACCAR is recalling certain 2020-2021 Peterbilt 520 trucks because the rear brake signal hose may have a missing quick release valve. This could cause brake failure and increase crash risk during normal use. Read more at govinfonow.com/recall/79946-peterbilt-520-2020-recall-missing-brake-valve-risks-crash.
Source Summary by GovInfoNow · govinfonow.com/recall/79946-peterbilt-520-2020-recall-missing-brake-valve-risks-crash · Updated October 4, 2026 · Official notice: NHTSA #21V720000
Cite this page
“Peterbilt 520 (2020) recall: Missing brake valve risks crash.” GovInfoNow, updated October 4, 2026. https://govinfonow.com/recall/79946-peterbilt-520-2020-recall-missing-brake-valve-risks-crash. Based on NHTSA recall #21V720000 (https://www.nhtsa.gov/recalls?nhtsaId=21V720000).
Why it’s dangerous
A missing quick release valve prevents proper timing of rear brake release. This could cause brake failure during normal driving, increasing the risk of a crash or injury.
Who’s affected
Owners of 2020-2021 Peterbilt 520 trucks are affected. Drivers using these trucks without the quick release valve are at higher risk of brake failure.
How to tell if you have this one
Check if your 2020-2021 Peterbilt 520 has a missing quick release valve on the rear brake signal hose. The recall covers vehicles sold between 2020 and 2021.
- Brand
Peterbilt- Category
Vehicle
What to do — step by step
Check for missing valve
Inspect the rear brake signal hose for a missing quick release valve.
Get free repair
Dealers will install a quick release valve if needed at no cost.
What NHTSA says to 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.
Questions people ask
Why is this recall happening?
The quick release valve on the rear brake signal hose may be missing, causing brake failure and increasing crash risk.
How do I know if my truck is affected?
Your 2020-2021 Peterbilt 520 with a missing quick release valve on the rear brake signal hose is affected.
What should I do if I have the affected truck?
Dealers will inspect your truck and install a quick release valve if needed at no cost.
Contact Peterbilt
We’ve drafted a message you can send Peterbilt to request your refund or repair — edit it as you like.
Subject: Recall 21V720000 — Peterbilt Peterbilt Hello, I own a Peterbilt that is covered by recall 21V720000 from Peterbilt. The official recall notice states: 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. I’m writing to arrange the remedy described in the recall (a refund, repair, or replacement as applicable). Could you please tell me the next steps to resolve this? Thank you.
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Where this comes from
The facts (hazard, remedy, dates, manufacturer) are pulled from the official NHTSA recall record. The plain-language summary and step-by-step checklist are written by GovInfoNow to make the official notice easier to act on — they don’t replace it.
- Official source: NHTSA Recall #21V720000 (September 16, 2021)
- Plain-language summary written by qwen3:4b on October 4, 2026, from the official record above. Not reviewed by a person — if it conflicts with the NHTSA notice, the notice is correct. Report an error on this page.
- GovInfoNow is an independent service and is not a government agency. We republish official NHTSA recall data; we don’t issue, amend or administer recalls.