Technical Bulletins


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Did You Know?

WABCO is the first to the NA market with OnGuard. 90,000+ systems in the field and 32 billion highway miles.

Automatic Lift Axle Control System

WABCO is focused on continuously developing integrated safety technology and efficient system solutions, delivered by the broadest and most experienced support network.


SmartTrac™ Automatic Trailer Lift Axle Control System is an intelligent solution that monitors the load on the trailer suspension and automatically raises and lowers the lift axe(s) independent of driver input. The system complies with U.S. DOT legal load limits. WABCO designed this system to reduce chances of overloading the trailer fixed axle(s) by using intelligent algorithms. The system integrates with SmartTrac’s ABS or RSS without requiring additional ECUs and is compatible with any air ride equipped lift axle suspension.

Fleets that have trailers returning empty or with reduced loads throughout the day are primary beneficiaries of automatic lift axle systems. The Automatic Trailer Lift Axle Control System plays a vital role in reducing operating costs such as fuel costs due to reduced rolling resistance and tire costs. Manual lift axle systems suffer from drivers neglecting to manage the lift axle position properly. This results in exposing the primary axle to overload conditions or losing benefit of a lift axle system when the axle is left lowered on an empty trailer. The system can be configured via TOOLBOX™ 11.3 for specific applications and local road laws.

The Trailer Automatic Lift Axle Control System can be configured to allow axle(s) to be automatically lowered when the trailer is parked or configured for a manual switch which allows for drivers to have the ability to lower an axle, while simultaneously using the automatic lift and lower feature. Configuring to automatically lower an axle while parked is ideal for fast loading applications or slider repositioning.

Features & Benefits

  • Fully automated to reduce chance of driver error
  • The system can be configured VIA TOOLBOX™11.3 for specific applications and local road laws
  • Reduced risk of overloading the primary axle(s)
  • Increased fuel efficiency due to reduced rolling resistance
  • Increased life of lift axle tire
  • Reduced vehicle downtime, labor and maintenance costs
  • Increased brake life
  • Increased wheel end life
  • Potential toll savings for lifted axle(s)
WARNING: This product can expose you to chemicals including Nickel, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to