NHTSA Recall 18V409000: Check valve (service brakes)
Daimler Trucks North America LLC reported this safety recall to NHTSA on , covering an estimated 109 vehicles. It affects 2017–2018 Thomas Built Buses Saf-T-Liner Efx.
| NHTSA campaign | 18V409000 |
|---|---|
| Manufacturer campaign | FL-774 |
| Component | SERVICE BRAKES, AIR › SUPPLY › CHECK VALVE |
| Report received | June 15, 2018 |
| Owner notification | August 12, 2018 |
| Initiated by | Manufacturer |
Defect
Daimler Trucks North America LLC (DTNA) is recalling certain 2017-2018 Thomas Built Buses Saf-T-Liner EFX school buses. The check valve for the air brake system may not be plumbed correctly which can cause the primary air system to not be isolated from the secondary air system.
Safety risk
In the event of a rapid loss of air pressure in the secondary system, the incorrectly plumbed check valve can cause rapid air loss in both secondary and primary system, causing the parking brakes to activate suddenly. This will increase the risk of a crash.
Remedy
DTNA will notify owners, and dealers will inspect and repair the check valve as needed, free of charge. The recall began on August 12, 2018. Owners may contact DTNA customer service at 1-800-547-0712. DTNA's number for this recall is FL-774.
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.safercar.gov.
Vehicles covered by recall 18V409000
Being listed here means the campaign covers the model year, not that every car was built with the defect or is still unrepaired. Enter your VIN above to check your specific vehicle. Recall repairs are free at authorised dealers. Source: NHTSA, October 2026.