The Turner Performance Products Brake Master Cylinder Re-build Kit contains all the components required to re-furbish one master cylinder. Sold as a complete kit by position. Note: Kit contents will vary by fitment and are subject to change. Detailed Specifications: Cup seal(s), master cylinder: 2. Washer(s): 2. Boot(s): 1. Spring(s): 1. Snap ring(s): 2. O-ring kit: 1.