BMW E39 Bosch ABS Hydraulic Control Unit - Used Original Parts

Diagnosis and Common Symptoms

As specialists in M-Power and classic BMW platforms, we frequently diagnose failures in the E39's braking dynamics systems. A faulty ABS hydraulic unit will typically trigger the notorious "trifecta" of dashboard warning lights: ABS, DSC (or ASC), and the amber BRAKE light.

Diagnostic scans will often reveal fault codes related to the pre-charge pump, pump motor failure, or internal pressure sensor faults (e.g., 5E20). In many cases, the system may erroneously report a faulty wheel speed sensor when the root cause is the hydraulic unit or the attached electronic module. Functional symptoms include a complete loss of Anti-lock Braking and Dynamic Stability Control, a hard or unresponsive brake pedal, or the ABS pump running continuously.

Introduction

Restore the critical safety systems of your BMW E39 with a Genuine, road-tested ABS Hydraulic Control Unit from M.S. Motor. Sourced directly from our curated inventory of donor vehicles, each component is a direct replacement for your failed original. Every unit undergoes a comprehensive bench test to verify pump activation and pressure integrity, ensuring it performs to factory specifications upon installation.

Product Details

• Brand: Bosch

• Model Compatibility: BMW E39 (525i, 528i, 530i, 540i, M5)

• Part Name: ABS Hydraulic Pump and Valve Block

• Condition: Genuine Used (Tested Working)

• Notes: This listing is for the hydraulic unit only. It is critical to match the Bosch part number on your existing unit to ensure compatibility. Professional installation and a complete brake system bleed with diagnostic software are required.