Buy WAB4008640090 - Genuine Wabco E4C 12V 4S4M ABS Control Module - wisentpartscenter.com

Description

The Genuine WABCO ABS Control Module is a 12V electronic control unit (ECU) designed for compatible heavy-duty trucks equipped with a WABCO E4C 4S/4M anti-lock braking system. This module monitors wheel speed signals and controls ABS braking functions to help prevent wheel lockup during braking. With support for four wheel speed sensors and four modulator control channels, it helps maintain vehicle stability, steering control, and braking performance under demanding road conditions.

Key Functions

- Monitors wheel speed signals from four ABS wheel speed sensors.
- Controls four ABS modulator channels to regulate brake pressure during wheel lockup conditions.
- Helps maintain steering control and vehicle stability during hard braking.
- Detects ABS system faults and supports diagnostic communication.
- Coordinates electronic ABS operation with the vehicle's air brake system.

Fitment & Specifications

- Brand: WABCO
- Part Type: ABS Electronic Control Unit (ECU)
- System: WABCO E4C / PABS
- ABS Configuration: 4S/4M (4 Sensors / 4 Modulators)
- Operating Voltage: 12V DC
- Vehicle Applications: Compatible Freightliner, International, Kenworth, Mack, Peterbilt, and Volvo heavy-duty trucks
- Mounting: Cab-mounted ECU
- Mounting Holes: 3 × 7.5 mm
- Mounting Hole Spacing: 112 × 122 mm
- Programming: Vehicle-specific programming required before operation

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The WABCO ABS Control Module manages the electronic operation of the vehicle's anti-lock braking system. It continuously receives wheel speed information from the ABS sensors and evaluates whether individual wheels are approaching lockup during braking. When excessive wheel deceleration is detected, the module commands the appropriate ABS modulators to adjust brake pressure, helping the wheels maintain traction and allowing the driver to retain steering control. The E4C 4S/4M configuration provides independent control of four ABS modulator channels.

Issue Symptoms / When to Replace

A faulty ABS control module can interfere with the vehicle's anti-lock braking operation. Common signs that the module may require inspection or replacement include:

- ABS warning light remains illuminated.
- ABS system fails to complete its normal diagnostic checks.
- Loss of communication with the ABS control module.
- ABS modulator control faults or inconsistent ABS operation.
- Wheel speed sensor fault indications that persist after the sensor circuits have been verified.
- ABS system not responding correctly during diagnostic testing.

Similar symptoms can result from damaged wheel speed sensors, faulty modulator valves, wiring problems, corroded connectors, poor grounds, or inadequate power supply. Proper ABS diagnostics should confirm whether the ECU is responsible before replacement.

Brand Information

WABCO is a commercial vehicle technology manufacturer specializing in braking, vehicle stability, suspension, and electronic control systems. Now part of ZF, WABCO has extensive experience developing ABS technologies for heavy-duty trucks and trailers. Its E4C electronic control units are designed to manage the operation and diagnostic functions of compatible commercial vehicle anti-lock braking systems.

Installation Notes

Before installing the WABCO ABS Control Module, verify the 12V 4S/4M configuration and inspect the electrical connectors, wiring, and ground connections. Vehicle-specific ECU programming is required before operation using compatible WABCO diagnostic equipment. After programming, clear fault codes and verify proper ABS operation.

How to Identify an OEM Part

The Genuine WABCO ABS Control Module can be identified by the WABCO logo and factory identification label on the ECU housing. Verify the manufacturer number 4008640090 and compare the electrical connector, mounting points, and E4C 12V 4S/4M configuration with the original module.

Why Buy S4008640090 From Wisent Parts Center?

  • 1 Year
    Warranty

  • Genuine Parts

    Authentic OEM parts

  • Final Sale

    Returns not accepted

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Warranty & Return Information
Warranty Information

Wisent Parts offers a 1-year warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

This part is sold as a final sale item and cannot be returned or refunded, including if it was ordered in error. Please confirm fitment before ordering - send us your VIN, engine serial number, or original part number and we will verify it for you. For full details, please refer to the Returns page.