The AP Racing master cylinder (Ø 17.8 mm) with a spherical bearing, part number CP7855-91PRTE, is a push-type model designed for single-circuit competition hydraulic systems. Its one-piece piston and rod assembly and its extra-short stroke before the fluid supply is cut off contribute to the system’s efficiency.
The hard-anodized aluminum alloy body is equipped with a protective bellows. Mounting is via a spherical bearing at the rear of the master cylinder.
AP Racing master cylinders come with a small colored plastic clamp wrapped around the body to facilitate diameter identification. The part number and nominal diameter are also marked on the body.
The following table applies to push-type master cylinders. This part number features a BLUE clamp corresponding to 17.8 mm - 0.70 in.
| Color | Diameter in mm | Diameter in inches |
|---|---|---|
| BLACK / ORANGE | 14 mm | 0.551 in |
| BLACK / RED | 15 mm | 0.590 in |
| BLACK | 15.9 mm | 0.625 in - 5/8 in |
| BLACK / YELLOW | 16.8 mm | 0.661 in |
| BLUE | 17.8 mm | 0.70 in |
| GREEN | 19.1 mm | 0.75 in - 3/4 in |
| ORANGE | 20.6 mm | 0.812 in - 13/16 in |
| RED | 22.2 mm | 0.875 in - 7/8 in |
| WHITE | 23.8 mm | 0.937 in - 15/16 in |
| YELLOW | 25.4 mm | 1.00 in |
Repair kit part number: AP Racing CP7855-91RK, sold separately.
Check the sizes of the pedal support and mounting bracket on the AP Racing diagram. The -93, -94, -95, and -96 versions have a larger housing than the smaller bore sizes. Adapt the UNF fittings and reservoir to the mounting.
The photo shows the AP Racing CP7855 range and is not binding regarding the color of the identification clamp. To select the model suitable for your mounting, refer to the part number and technical specifications listed in this sheet.
Before ordering, be sure to check the master cylinder diameter, thread sizes, and fastening type. If in doubt, our technicians can help you select the correct part number for your system. Feel free to contact them.
