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Thomas Built Buses Saf-T-Liner EFX Recall 18V409: School Bus Air Brake Valve May Cause Sudden Parking Brake Lock

NHTSA campaign 18V409, reported June 15, 2018, 109 vehicles potentially affected.

What this recall means for you

Certain 2017-2018 Thomas Built Buses Saf-T-Liner EFX school buses may have an air brake check valve that is plumbed incorrectly. This can prevent the primary air system from being isolated from the secondary air system.

If the secondary air system loses pressure rapidly, the faulty check valve can cause air to drain from both systems at once. The parking brakes may then activate suddenly, which increases the risk of a crash.

Daimler Trucks North America (DTNA) will notify owners, and authorized dealers will inspect and repair the check valve as needed at no charge. Owners can contact DTNA customer service at 1-800-547-0712 using recall number FL-774, and should check their vehicle identification number (VIN) for open recalls.

Check whether this recall is open on your vehicle

The repair is normally free at an authorized dealer.

Official recall notice

Safety recall 18V409Daimler Trucks North America LLC
Component
SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE
Problem
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.
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.

Affected vehicles

Thomas Built Buses Saf-T-Liner EFX20172018