Lightweight Composite Clutch Master Cylinder for MERCEDES-BENZ A2462900112

APPLICATION
The following vehicle models are based on the Mercedes-Benz MFA platform and were produced between 2011 and 2019, serving as prime examples of the platform's component sharing.
Vehicle SeriesModel CodeProduction YearsMain Engine TypesCompatible Transmission
A-ClassW1762012–2018M270 (1.6L Turbo / 2.0L Turbo), OM607, OM6516-Speed Manual / 7-Speed Dual-Clutch Transmission
B-ClassW246 / W2422011–2018M270 (1.6L Turbo / 2.0L Turbo), OM607, OM6516-Speed Manual / 7-Speed Dual-Clutch Transmission
CLA CoupéC1172013–2019M270 (1.6L Turbo / 2.0L Turbo), OM6516-Speed Manual / 7-Speed Dual-Clutch Transmission
CLA Shooting BrakeX1172015–2019M270 (1.6L Turbo / 2.0L Turbo), OM6516-Speed Manual / 7-Speed Dual-Clutch Transmission
GLAX1562013–2019M270 (1.6L Turbo / 2.0L Turbo), OM6516-Speed Manual / 7-Speed Dual-Clutch Transmission
These models must be equipped with a manual transmission or a dual-clutch transmission capable of manual mode; vehicles with conventional automatic transmissions do not use a clutch master cylinder. Please verify compatibility using the VIN and original part number before purchasing.

OE NO:
A2462900112
2462900112

Key Functions
The functional contributions of the composite housing are primarily evident in three areas:
First, weight management. Lightweight design was a priority for MFA platform vehicles from the outset; the composite master cylinder housing aligns with the vehicle's overall weight-reduction strategy, ensuring no additional weight is added to the engine bay components.
Second, corrosion resistance. The engine bay environment is characterized by high humidity and significant temperature fluctuations. Composite materials offer superior resistance to hydraulic fluid, moisture, and common chemicals compared to standard metal components, thereby reducing the risk of seal failure caused by housing corrosion.
Third, thermal stability. As the master cylinder is subjected to prolonged heat within the hydraulic system, material thermal stability directly impacts the long-term fit precision between the seals and the cylinder body. Composite materials typically exhibit less deformation under heat than untreated aluminum alloy components, helping to maintain system sealing integrity.

Q1: Are A2462900112 and 2462900112 exactly the same?
They are the same part. "A" is the standard prefix in the Mercedes-Benz part numbering system; the numbers following the prefix are identical. Both formats appear in parts catalogs across different markets, and either number can be used for procurement and lookup.

Q2: Is the strength of the composite housing sufficient to withstand hydraulic operating pressure?
The use of composite materials for hydraulic component housings is a well-established practice. Mercedes-Benz's selection of a composite master cylinder housing for the MFA platform is an original design choice, not a cost-cutting substitute. The material was validated against the operating pressure range of the clutch hydraulic system during the design phase, and its strength meets OE specifications.

Q3: Is it normal for the pedal feel to be unusual after replacing the master cylinder?
If air is not thoroughly bled from the hydraulic system after installing the new part, the pedal may feel soft or have excessive travel. The pedal feel should return to normal once the bleeding process is fully completed. For certain models equipped with travel sensors, it is also necessary to verify the sensor signal after replacement to ensure that electronic functions—such as the start-stop system or hill-start assist—operate correctly; using a diagnostic tool for verification is recommended.

Q4: What precautions should be taken when storing this part?
The composite housing is not susceptible to metal corrosion and remains stable when stored in a dry environment at room temperature. However, note that internal seals (rubber components) may age prematurely if exposed to high temperatures or intense light for extended periods; it is recommended to store the part in its original packaging away from light and to adhere to the supplier's recommended shelf life.

Q5: Is it necessary to replace the slave cylinder at the same time?
It is not mandatory, but simultaneous replacement is recommended if the slave cylinder shows signs of fluid leakage or abnormal travel. There is a high probability of synchronized aging between the master and slave cylinders in a clutch hydraulic system. Replacing them separately not only increases the cost of a second service visit but also extends vehicle downtime—a time cost that, for fleet operators, often exceeds the price difference of the parts themselves.