WABCO EBS-Trailer Modulator 24 Volt 4801020640 Electronic Braking Valve for Semi Trailer

The WABCO EBS-Trailer Modulator 24 Volt (part number 4801020640) is an electronically controlled braking device developed for modern semi-trailers. Compared with conventional pneumatic braking, it reacts about thirty percent faster and produces a noticeably shorter stopping distance, a decisive advantage for heavily loaded combinations on the highway. The modulator receives electronic control signals from the tractor and applies trailer brake pressure with high accuracy, so the trailer slows in step with the towing vehicle.

Beyond basic braking, the unit integrates ABS, roll stability control and trailer swing suppression in a single compact housing. It automatically adjusts braking force according to the current load, which keeps the combination stable when the trailer is part loaded or fully loaded. If the electronic section ever fails, the pneumatic circuit continues to provide basic braking, so the vehicle always retains a safe fallback.

• Fast Electronic Braking: The EBS modulator responds around thirty percent faster than traditional pneumatic brakes and shortens the stopping distance of the whole combination.
• Synchronized Tractor and Trailer: The device realizes synchronized braking between tractor and trailer and automatically adjusts braking force according to the current load.
• Integrated Safety Functions: Built-in ABS, roll stability ESC and trailer swing suppression keep the combination stable, while AEB and ACC functions are available as options.
• Smooth Braking and Wear Monitoring: The modulator delivers smooth, progressive braking, monitors brake pad wear and helps reduce tire wear and maintenance costs.
• Self-Diagnosis: A self-diagnosis function supports quick fault finding, and the pneumatic circuit maintains basic braking if the electronics fail.
• Air Suspension Compatibility: The modulator is suitable for heavy trucks and semi-trailers and is compatible with air suspension systems.

This EBS trailer modulator is intended for semi-trailers that tow behind modern tractor units, including curtainsiders, box trailers, flatbeds, tankers and container chassis. It is especially valuable for high-mileage fleets and for operators carrying unstable or high-value loads, where synchronized braking and roll stability directly reduce the risk of jack-knifing and trailer swing.

The unit also suits trailers already fitted with air suspension, because the modulator's load-sensing braking works together with the suspension to keep the combination level and predictable through corners and emergency stops.

Each WABCO EBS trailer modulator is supplied in a neutral export carton with shock-absorbing foam and a sealed electrical connector cover. Private-label packaging and OEM cartons can be arranged, and every box is labelled with the part number and voltage for simple inventory control.

All units are built to original equipment specification and tested before dispatch. We offer a twelve-month warranty, technical documentation and after-sales support, and we welcome enquiries for samples, distributor pricing and container quantities.