HELLA 5SD 014 989-001 Control Unit, brake / driving dynamics for VW PASSAT

Anti-lock Braking System (ABS) Control Module: This is the electronic brain of the VW ABS system. It receives signals from the wheel speed sensors on each wheel. Here’s what it does:

1. • Interprets data: It analyzes the wheel speed data to identify if a wheel is about to lock up during hard braking.
   • Controls the ABS pump: If a lockup is imminent, the module sends instructions to the ABS pump.
   • Modulates braking pressure: The ABS pump rapidly builds and releases pressure in the brake line going to the locking wheel, preventing it from completely stopping and maintaining some rotation for steering control.

2. Electronic Brake Control Module (EBCM): In some VW models, the ABS functionalities might be integrated into a more comprehensive Electronic Brake Control Module (EBCM). This EBCM would not only manage the ABS but also other electronic brake functions like:

   • Electronic Brake-force Distribution (EBD): This system distributes braking force between the front and rear wheels for optimal stopping power and stability.
   • Traction Control System (TCS): This system helps prevent wheelspin during acceleration on slippery surfaces by reducing engine power or applying brake force to specific wheels.