obp Integral Master Cylinder

Brake and Clutch Master Cylinders — 0.625″, 0.7″, 0.75″, 0.875″ and 1-inch Bore Sizes

The space-saving, integral design of the obp master cylinder is a game-changer for bulkhead-fit pedal boxes, making it perfect for installations where the cylinder sits conveniently in the engine bay. With the built-in reservoir, you eliminate the need for extra brake lines required in a remote setup, ensuring a leak-free operation and a cleaner, more efficient system.

The obp Master Cylinder is designed for compatibility, with a 2.25” (57mm) bolt-hole spacing that matches most standard mounting patterns in the industry. This makes it an ideal choice for a wide variety of applications, including automotive, motorsport, agriculture, hydraulic systems, and more.

Integral Master Cylinders Key Features

• Lightweight at just 350g
• Vertical Mounting Flange for easy installation
• 3/8”-24 UNF Outlet for reliable connections
• Standard 84mm Push Rod Length
• M8 Bolt Hole Size for universal mounting

Choosing the Right Master Cylinder Bore Size

When selecting the proper master cylinder size for automotive and motorsport applications, a general rule of thumb is:

• 0.625-inch Bore for front brakes
• 0.700-inch Bore for rear brakes
• 0.750-inch Bore for the clutch
• 0.875-inch or 1-inch

However, this may vary depending on the size of your brake calipers because some calipers require more brake fluid for optimal performance.

• Inlet Fitting: 7/16-inch-20 UNF
• Outlet Fitting: 3/8-inch-24 UNF
• Push Rod Thread: 5/16-inch
• Pushrod Length: 84mm
• Bolt Hole Spacing: 1/4-inch

To add some context, the 3/8”-24 UNF outlet indicates that the outlet port of the master cylinder has a diameter of 3/8 inches, with 24 threads per inch, following the UNF threading standard. This ensures a strong, leak-resistant connection, which is critical in high-pressure applications like braking systems in racing vehicles.

Why Choose obp Motorsport?

When it comes to braking accessories, obp Master Cylinders have earned their reputation as one of the most sought-after options on the market. Featuring an innovative internal double-seal setup, these master cylinders are prized for their unbeatable combination of reliability, affordability, and top-tier performance.

Whether you’re pushing the limits on the racetrack or working in demanding industrial environments, obp Master Cylinders are designed to deliver outstanding results wherever high-quality components are essential.