Brand: Optimum Balance Products (OBP)
These master cylinders have been designed by OBP as a less-expensive alternative to the Girling brand. They have a small (1 3/4" diameter) fluid reservoir built into the front of the casting. The outet port faces the rear of the car, which is ideal for cars with limited space in front of the master cylinder. All sizes come complete with a pushrod. The pushrod measures 3.3" long overall (approximately 3" exposed from the mounting flange). Suitable for brakes or clutch.
- Outlet Port Thread: 3/8-24 (3AN)
- Reservoir Cap Thread: 1.75"
- Pushrod Thread: 5/16-24
- Cylinder Length (measured from mounting face): 3.95" (4.2" including cap)
- Mounting Hole Spacing: 2 1/4" (vertical)
- Stroke: 1.375"
Note: These master cylinders are not manufactured by Girling, Lucas, or TRW. They are very high-quality reproductions, made in the UK as an alternative to the (increasingly expensive) original. All dimensions and threads are the same as on the Girling.