2021 Thomas Built Buses Recall for Brake Caliper Bolt Tightening Defect
Daimler Trucks North America is recalling 2021 Thomas Built Buses Saf-T-Liner HDX and EFX school buses because a brake caliper bolt may be incorrectly tightened, potentially reducing brake effectiveness.
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 results in reduced brake effectiveness and an increased risk of a crash, which aligns with the rubric criteria for a score of 4.
Plain-English summary
Daimler Trucks North America, LLC (DTNA) is recalling certain 2021 Thomas Built Buses Saf-T-Liner HDX and EFX school buses. The recall addresses a defect where one of the six brake caliper mounting bolts on the driver side steer axle may have been incorrectly tightened.
The loose bolt could cause the other caliper bolts to loosen. Insufficiently tightened bolts may not provide adequate clamping force between the brake caliper and brake anchor plate, resulting in reduced brake effectiveness and an increased risk of a crash.
DTNA will notify owners, and dealers will inspect and repair the vehicles as necessary, free of charge. The recall began on March 17, 2021. Owners may contact DTNA customer service at 1-800-547-0712 or the NHTSA Vehicle Safety Hotline at 1-888-327-4236.
The recalled product
- Product
- THOMAS BUILT BUSES SAF-T-LINER EFX, SAF-T-LINER HDX
- Brand
- THOMAS BUILT BUSES
- Manufacturer
- Daimler Trucks North America, LLC
- Category
- Vehicle — School Bus
- Hazard
- Affected units
- 6
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)
- SAF-T-LINER EFX
- SAF-T-LINER HDX
Distribution
Distributed nationwide across the United States.
Related recalls
Same brand · THOMAS BUILT BUSES
- High2027 Thomas Built Buses Recall for Headlight Software Error
NHTSA · 2026-10-01
- Severe
- Severe
- Severe
- HighThomas Built Buses Recalls SAF-T-LINER HDX2 Due to Door Malfunction
NHTSA · 2026-06-26
Same manufacturer · Daimler Trucks North America, LLC
See all →- SevereFreightliner and FCCC Trucks Recalled for Fuel Hose Separation Risk
NHTSA · 2026-10-07
- SevereFreightliner Recalls Business Class M2 Trucks for Fire Risk
NHTSA · 2026-10-01
- Severe
Same hazard · brake failure
See all →- Severe
- Severe
- SevereNova Bus Recalls 2024-2025 LFS Transit Buses for Parking Brake Defect
NHTSA · 2026-09-22
- SeverePeterbilt Recalls 2027 548 Trucks Due to Brake Valve Size Issues
NHTSA · 2026-09-01
- Severe
Similar recalls
- SevereThomas Built Buses Recalls 2018-2019 Models Due to Brake Caliper Bolts
NHTSA · 2018-10-05
- SevereThomas Built Buses Recall 2019-2020 Models for Brake Caliper Bolt Issue
NHTSA · 2020-03-03
- SevereThomas Built Buses Recalling School Buses for Brake Bolt Issue
NHTSA · 2018-05-29
- Severe
- SevereThomas Built Buses Recalling School Buses Due to Seat Frame Cracking
NHTSA · 2022-07-19
- SevereThomas Built Buses Recalls 2017-2018 Saf-T-Liner HDX School Buses
NHTSA · 2017-02-27