MCP Master Cylinder - 7/8" with AN-3 Fitting

The MCP 18875B is the gold standard brake master cylinder for quarter midget racing — and for good reason. This black anodized billet aluminum cylinder delivers reliable, consistent brake feel whether you're setting up a new car or upgrading from the older cast #875 unit.

The 7/8" bore delivers firm, progressive pedal response that drivers and crew chiefs trust on the track. The AN-3 fitting makes for a clean, leak-resistant line connection, and the billet construction keeps weight under 1 lb. without sacrificing durability. When paired with a standard 650QB Brake Caliper commonly used for quarter midgets, use with DOT5 brake fluid only.

Whether you're building a new quarter midget, refreshing an existing brake setup, or sourcing parts for a kart or micro sprint, the MCP 18875B is a proven, pit-proven choice trusted across youth and amateur motorsports.

Specs at a Glance:

• Bore: 7/8"
• Fitting: AN-3
• Construction: Billet aluminum, black anodized
• Brake Fluid Compatibility: DOT 5 Only
• Mounting: 5/16" (8mm) holes, 1-5/16" center-to-center bolt pattern
• Dimensions: approximately 5" × 1" × 4-1/4"
• Weight: Under 1 lb.
• Replaces: MCP #875 cast master cylinder
• Applications: Quarter midgets, karts, micro sprints, mini sprints, Jr. dragsters, and other small-displacement racing applications

MCP Racing is one of the most trusted names in small-car brake components. Their master cylinders are found on winners at tracks across the country — from local QMA and NASCAR Youth Series clubs to national-level competition.