Sourced from ATE, this master brake cylinder (03.2120-2031.3) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Diameter [mm]: 20, Plastic mm, Thread Size: M10x1, Number of connectors: Copper, Brake System: ATE, Length 1 [mm]: 32, Copper mm — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit CITROËN, PEUGEOT, RENAULT, SEAT and 2 other makes models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 0 204 122 243, 0 204 123 105, 0 204 123 180, 0 204 123 249 and 81 more. Matching these numbers confirms a like-for-like replacement with no loss of function. ATE is a recognised supplier of automotive braking components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.

ATE (Alfred Teves), founded in 1906 in Frankfurt, Germany, is one of the most respected names in braking technology, now part of the Continental Corporation. ATE specialises in brake pads, brake discs, brake calipers, brake fluid, and hydraulic components. As the original equipment supplier to Volkswagen, Audi, BMW, Mercedes-Benz, and Porsche, ATE sets the standard for braking safety. With over a century of braking innovation, ATE parts provide the confidence of OE-quality stopping power in every driving situation.