The Dorman First Stop Brake Wheel Cylinder is a dependable part designed to meet or exceed OEM requirements. Crafted with high-grade EPDM rubber cups and boots, this wheel cylinder ensures lasting performance. The cylinder bores are surface-tested, providing an optimum sealing space for pressure cups. It’s suggested to replace this when servicing drum brake. Compliant with SAE standards, this product offers reliable, professional-grade solutions for your vehicle’s brake system.