SBF 70 years logo
MenuMENU
SearchSEARCH

Thomas Built Buses adds electronic stability control, other new options

The OEM will offer electronic stability control for the Saf-T-Liner C2, Bendix air disc brakes for the EFX and a severe duty harness for the HDX and EFX.

September 9, 2015
Thomas Built Buses adds electronic stability control, other new options

SmartTrac electronic stability control is a new option for Thomas Built’s Saf-T-Liner C2 school buses (pictured).

2 min to read


HIGH POINT, N.C. — Thomas Built Buses has teamed up with Meritor WABCO to offer new factory-installed SmartTrac electronic stability control (ESC) on its Saf-T-Liner C2 school buses.

SmartTrac ESC is a vehicle safety system that intervenes automatically when it senses instability that could lead to rollover or loss of bus control.

Ad Loading...

“When faced with rollovers and loss-of-control accidents, drivers normally are not aware that vehicle dynamics are about to become critically unstable until the point of no return is already reached,” said Stephen Hampson, president and general manager for Meritor WABCO.

Hampson explained that SmartTrac ESC uses various sensors to compare the vehicle’s actual movement to performance models. The system works with the Saf-T-Liner C2’s air disc and air drum brakes.

“If the vehicle shows a tendency to leave the driver’s intended path or exceeds a critical acceleration threshold, SmartTrac ESC helps the driver maintain control,” he said. “The system applies the appropriate brakes selectively and better aligns the vehicle with the driver’s intended path of travel.”

In addition to SmartTrac ESC, Thomas Built Buses will introduce Bendix ADB22X air disc brakes for Saf-T-Liner EFX school buses in the fourth quarter of this year. Thomas Built’s C2 and HDX school buses already offer the Bendix air disc brakes.

Company officials said that the ABD22X air disc brakes offer enhanced control, shorter and safer stopping distances, longer life and improved performance over standard brakes.

Ad Loading...

In early 2016, Thomas Built will also introduce severe duty chassis harness protection for the HDX and EFX. The new severe duty harness, already an option for the C2, is an upgrade for the main chassis electrical harness that protects the electrical system from water and debris. Company officials said that the severe duty harness is made of durable braided nylon that allows water and debris to pass through instead of becoming trapped.

“All three of these innovations are testaments to our commitment to continuous improvement,” said Caley Edgerly, president and CEO of Thomas Built. “We are dedicated to building and designing buses that are safe, efficient and provide our customers the lowest total cost of ownership possible. These innovations help us do just that.”

For more information about SmartTrac ESC, ADB22X air disc brakes or the new severe duty harness, customers can speak with a Thomas Built dealer.

More Safety

A close up detail of the back of a school bus with text reading "Insight From 10 Years of NHTSA Data."
Safetyby Elora HaynesJuly 22, 2026

NHTSA Releases 10-Year Review of Fatal School Bus Crashes

The latest federal analysis reinforces the safety of school buses while identifying where school-age pedestrians and other motorists remain most at risk.

Read More →
Graphic for a School Bus Fleet news story featuring the NASDPTS logo, a speaker presenting with a microphone, and the headline, "38.4 Million Stop-Arm Violations," highlighting annual illegal school bus passing estimates.
Safetyby Amanda HuggettJuly 21, 2026

2026 NASDPTS Survey: Data Shows Further Reduction of Illegal Passing

New data is in! School bus stop-arm passings are down to 38.4 million violations per year, about a 2.3% decrease from last school year — but passings on the right side of the bus are higher than ever.

Read More →
Graphic illustrating a fatal school bus incident in New York, featuring a close-up view of the front of a yellow school bus with a cracked-glass overlay and the headline, "7-Year-Old Fatally Struck in New York," dated July 9, 2026, alongside the School Bus Fleet logo.
Safetyby Staff and News ReportsJuly 9, 2026

Another School Bus Fatality Reported in Monsey, New York

A 7-year-old girl died after being struck by a school bus in Rockland County, New York while crossing the street. Here's what we know.

Read More →
Ad Loading...
School buses at NSTA's SBDISC Roadeo with text reading "School Bus Drivers Put Their Skills to the Test."
Safetyby Staff and News ReportsJune 30, 2026

NSTA Announces 2026 School Bus Driver International Safety Competition Winners

Drivers from across the U.S. and Canada showcased their safety and driving skills, with two defending champions successfully retaining their titles.

Read More →
zonar system image
SponsoredJune 22, 2026

The Driver Shortage Playbook

Driver shortages are still a major challenge for student transportation fleets, but the real issue has shifted. It’s no longer just about filling seats quickly. It’s about finding safe, reliable drivers who meet performance expectations and want to stay. The Driver Shortage Playbook covers why traditional recruitment tactics are falling short and how school fleets are adapting with smarter hiring, stronger retention strategies and a greater focus on driver quality.

Read More →
Promotional graphic for a new Pro-Vision AI camera system. The image shows a monitor displaying camera views with AI object detection overlays, along with multiple cameras and recording hardware. Text reads "New Product," "Pro-Vision," and "Visibly Better." School Bus Fleet logo appears in the lower-right corner.
SafetyJune 11, 2026

Pro-Vision Launches AI-Powered 360° Camera System

The new Birdseye camera delivers real-time AI-based pedestrian and vehicle detections, full visibility around the bus, and telematics integrations.

Read More →
Ad Loading...
A New York school bus in the street.
Safetyby Elora HaynesJune 9, 2026

N.Y. & N.J. Coalitions Call for Modernized Transportation for Vulnerable Students

New statewide coalitions in New York and New Jersey are urging lawmakers to expand student transportation options for vulnerable students amid ongoing driver shortages.

Read More →
Graphic for an opinion article on illegal school bus passing. A school bus with its stop arm extended is stopped as children cross the street, while a black SUV drives past. Headline reads, “America’s School Bus Blind Spot.” School Bus Fleet branding appears in the corner.
SafetyJune 8, 2026

America Has a School Bus Passing Problem — and Distraction Is Making It Worse

Illegal school bus passing remains a major safety threat as distracted driving rises. This op-ed explores why awareness, enforcement, and stop-arm cameras matter more than ever.

Read More →
A black, white, and red graphic with an image of a school bus on a New York street and text reading "Legislative Roundup May 2026."
Safetyby Elora HaynesMay 29, 2026

School Bus Laws to Watch: New York Delays EV Mandate

Plus, federal lawmakers seek new funding for school bus safety as states weigh stop-arm enforcement, disability protections, and education spending.

Read More →
Ad Loading...
Emergency response personnel assist participants evacuating through the rear emergency door of a yellow school bus during a hands-on safety training exercise at Prosper ISD. Smoke fills the bus interior as responders demonstrate emergency evacuation procedures.
Safetyby News/Media ReleaseMay 21, 2026

Operation STEER Brings Emergency Response Training to North Texas

Prosper ISD hosted the third annual training for transportation professionals across 67 districts to learn how to respond to emergencies, such as rollovers and evacuations, and proper use of safety equipment.

Read More →