Mercedes W204 ABS Brake Pump Steering Hydraulic Braking Unit A2044313812

Mercedes W204 ABS Brake Pump Steering Hydraulic Braking Unit is an original component from the ABS and ESP System group, designed for precise pressure control in the braking system. Using a factory-original module ensures consistency with the vehicle's electronics, stable operation of the anti-lock braking system, and predictable vehicle behavior during emergency braking.

Specifications and technical data

• SKU: A2045455232
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045455232
• Substitutable numbers: A2045455232, A 204 545 52 32, A2044313812, A 204 431 38 12
• Category: ABS & Stability Hydraulic Units

Technical characteristics of the ABS control unit and pump

The presented assembly combines a hydraulic block with a pump and an electronic control unit responsible for analyzing signals from wheel speed sensors and controlling valves in a single housing. This design reduces pressure drops, shortens system response time, and facilitates diagnostics, as all key ABS functions are concentrated in one module.

The module was designed specifically for the Mercedes W204 platform, which means it is matched to the vehicle's electrical architecture, communication bus, and the logic of driver assistance systems. As a result, compatibility with factory safety features, such as traction control or electronic stability control, is maintained.

Purpose and application in the ABS and ESP System

As an element of the ABS and ESP System category, this control unit–pump assembly is responsible for:

• precise metering of pressure in the brake circuits during sudden braking,
• preventing wheel lock-up and loss of control,
• cooperation with electronic stability control systems that correct vehicle behavior in critical situations,
• maintaining repeatable braking parameters under varying road surface conditions.

Replacing the complete control unit and pump assembly is the recommended solution in case of recurring communication errors, circuit pressure issues, or mechanical damage to the hydraulic block, as it eliminates the risk of incompatibility between the electronics and the hydraulic part.

Benefits of using an original Mercedes module

Using an original solution dedicated to Mercedes allows for maintaining the factory performance parameters of the braking system. Key advantages include:

• consistency with vehicle software – no need to adapt aftermarket replacements with uncertain parameters,
• stable cooperation with wheel speed sensors and other body modules,
• maintaining predictable operation of active safety systems,
• reducing the risk of control unit errors resulting from design differences.

For workshops and users, this means faster diagnostics, easier installation, and a lower risk of warranty returns after brake system repairs.

Condition, selection, and installation

The item is offered as a used original component, which provides a reasonable compromise between repair costs and maintaining factory performance parameters. When selecting, it is recommended to compare the markings with the damaged module and verify compatibility with the specific vehicle equipment version to avoid communication issues within the vehicle network.

During installation, it is essential to follow brake system bleeding procedures and, if necessary, perform adaptation or coding in the vehicle in accordance with the manufacturer's guidelines. A correctly selected and installed control unit–pump assembly restores full ABS functionality and stable operation of driver assistance systems.

Related components and technical knowledge

If you are planning a comprehensive repair or upgrade of the drivetrain in your Mercedes and need other components from the same group, such as a clutch, dual-mass flywheel, or drivetrain elements, it is worth consulting verified technical materials – a practical supplement would be the article Clutch and dual-mass flywheel – diagnostics and selection of parts for the drivetrain, which helps to better plan the scope of service work.

If you are planning a comprehensive repair or upgrade of the braking zone in your Mercedes and need other components from the same group, such as pumps, control modules, or sensors related to electronic stability control, check the available parts in the ABS and ESP System Mercedes category.