Dorman 3644 Drum Brake Wheel Cylinder Repair Kit This application specific direct replacement kit contains new components to restore cylinder Made with high quality EPDM rubber cups and boots for long lasting performance Restores the original wheel cylinder's service life when the bore finish can be adequately surfaced Enables a low-cost repair without removing the wheel cylinder from the vehicle in most applications May require the use of a honing tool to properly finish the bore surface