Peterbilt 320 and 520 Trucks Recalled for Brake Signal Hose Defect
PACCAR is recalling 2016-2020 Peterbilt 320 and 520 trucks because a missing quick release valve may delay brake release, increasing crash risk.
What this means for you
Our assessment, not the agency’s: severity 4/5 (Severe).
The hazard poses a serious risk of illness, injury, or structural failure. Stop using the product immediately and contact the manufacturer for a refund or repair.
Our severity reasoning: The recall involves a structural vehicle defect in the braking system that explicitly increases the risk of a crash, meeting the criteria for a Severe rating.
Plain-English summary
PACCAR Incorporated is recalling certain 2016-2020 Peterbilt 320 and 520 vehicles. The recall affects trucks equipped with dual foot valves and a liftable tag or tri-drive rear axles. The defect involves the rear brake signal hose, which may be missing a quick release valve. This issue can cause a delay in brake release timing, causing the vehicles to fail to comply with Federal Motor Vehicle Safety Standard (FMVSS) number 121, "Air Disc Brakes."
A delayed brake release may increase the risk of a crash. PACCAR will notify owners, and dealers will check the vehicles for a quick release valve, installing one as necessary, free of charge. The recall began on March 24, 2020.
Owners may contact PACCAR customer service at 1-940-591-4220. PACCAR's number for this recall is 20PBB. 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.safercar.gov.
The recalled product
- Product
- PETERBILT 320, 520
- Brand
- PETERBILT
- Manufacturer
- PACCAR Incorporated
- Category
- Vehicle — Commercial Truck
- Hazard
- Affected units
- 233
Is your product affected?
Check your packaging against the codes below. If any of them match, the product is part of this recall.
Model numbers (2)
- 320
- 520
Distribution
Distributed nationwide across the United States.
Related recalls
Same brand · PETERBILT
- SeverePeterbilt Recalls 2027 548 Trucks Due to Brake Valve Size Issues
NHTSA · 2026-09-01
- Severe
- SeverePeterbilt 567 and 589 Trucks Recalled for Brake Air Tank Defect
NHTSA · 2025-11-17
- SeverePeterbilt rear brake piping clearance can cause loss of service brakes
NHTSA · 2025-05-28
- Severe
Same manufacturer · PACCAR Incorporated
See all →- High
- Severe
- High
- HighPETERBILT 579 Tractors Recalled for Air Brake Valve Installation
NHTSA · 2026-07-08
Same hazard · brake failure
See all →- Severe
- Severe
- SevereNova Bus Recalls 2024-2025 LFS Transit Buses for Parking Brake Defect
NHTSA · 2026-09-22
- Severe
- Severe
Similar recalls
- SeverePeterbilt 520 Trucks Recalled for Missing Rear Brake Valve
NHTSA · 2021-09-16
- HighPeterbilt 320 and 520 Trucks Recalled for Rear Turn Signal Defect
NHTSA · 2019-06-14
- SeverePeterbilt 520 Recalled for Incorrect Brake Relay Connections
NHTSA · 2020-11-25
- SeverePeterbilt Recalls 2027 548 Trucks Due to Brake Valve Size Issues
NHTSA · 2026-09-01
- SeverePeterbilt 320 and 520 Refuse Trucks Recalled for Suspension Defect
NHTSA · 2022-12-16
- Severe