The Bendix® EC‑80™ Electronic Control Unit (ECU) is a member of a family of three Bendix®-brand electronic Antilock Braking System (ABS) devices used to help improve the braking characteristics of air-braked heavy and medium-duty trucks, tractors, and buses. The Bendix® ABS ESP® ECU uses wheel speed sensors to monitor four wheel-ends to detect wheel-slip or wheel lock‑up during braking. The system intervenes when needed — using Pressure Modulator Valves (PMVs) to adjust and/or pulse the brake pressure — in order to optimize the contact between the tires and the road surface.