Wilwood 260-6765 7/8" Bore Master Cylinder Quality high volume Wilwood 7/8" Brake Master Cylinder. High volume, die cast aluminum master cylinder holds 8.2 ounces of brake fluid. 26% more fluid capacity than other master cylinders. This helps to keep you brake fluid cooler. Includes formed steel lid, bellow type gaskets, internal slosh baffles, and standard mounting dimensions. 1/8" NPT single outlet. The bigger the master cylinder is, the more fluid you get but you'll have less pressure at the caliper. The 3/4" master cylinder is the recommended size for most throw-out bearings.