Haldex Commercial Vehicle Systems added the ILAS E Air Suspension Valve, which can control the position of the lift axles through an electrical connection.
A 12V power supply is needed to keep the lift axles in the raised position.

When power is removed, the lift axles will automatically be lowered. This can be simply controlled via an electrical switch. When coupled with the Haldex TRS System, the lift axles can be controlled to raise and lower automatically as the air suspension reacts to changing loads in the trailer. The ILAS E / TRS System can be adjusted to react at various pressure conditions making the system versatile for single or multiply lift axle trailers.

The system simplifies the lift axle system with four push-to-connect fittings and a standard DIN electrical connection.

The lift axle will raise or drop automatically with the unloading or loading of the vehicle providing operational savings as the lift axle and wheels are not subjected to wear when the vehicle is empty.

More info: www.haldex.com