The Apec Rear BCY1038 Wheel Cylinder is a high-quality brake component made of grey cast iron with a piston diameter of 29mm. This wheel cylinder is designed for the rear axle of vehicles such as the Citroen, Fiat, and Peugeot Boxer, Ducato, and Relay models. With a thread size of 10x1 and a mounting bores distance of 37mm, this wheel cylinder is a reliable choice for maintaining proper brake function. The product comes with a part number of recommended accessories BBS4 and BSC1, ensuring complete compatibility and functionality for your vehicle.