OBP Integral Master Cylinder
Brake and Clutch Master Cylinders — 0.625″, 0.7″, 0.75″, 0.812″, 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
- 0.812″, 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.