AP Racing Master Cylinder 15.9 mm 115 mm CP2623-90PRM115 - AP-CP2623-90M115 - CP2623-90PRM115 - 3661768454619

AP Racing Master Cylinder, Ø 15.9 mm - 115 mm M8 x 1.25 rod

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Reference: AP-CP2623-90M115

Supplier Ref.: CP2623-90PRM115

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Carbon footprint: 1.1 kg CO₂

The AP Racing master cylinder (Ø 15.9 mm), part number CP2623-90PRM115, is designed for hydraulic controls for brake and clutch systems in racing applications. Its compact design is particularly well-suited for installations where space is limited.

Its forged aluminum body is lighter than that of the cast aluminum version, offering a weight savings of 50 g. It features a vertical mounting flange, a short stroke before the fluid supply shuts off, and UNF imperial hydraulic threads.

This version features a master cylinder diameter of 15.9 mm - 0.625 in - 5/8 in and an M8 x 1.25 threaded push rod measuring 115 mm from the mounting flange. Its BLACK plastic clamp allows for quick identification of the diameter.

Technical Specifications

Brand: AP Racing.
Manufacturer Part Number: CP2623-90PRM115.
Range: CP2623.
Actuation: Push.
Mounting: Vertical flange.
Master cylinder diameter: 15.9 mm - 0.625 in - 5/8 in.
Identification clamp color: BLACK.
Total stroke: 25.4 mm.
Hydraulic inlet: 7/16 in-20 UNF.
Hydraulic outlet: 3/8 in-24 UNF.
Stroke before supply shuts off: 0.68 to 1.09 mm - short.
Mounting hole center distance: 57.2 mm.
Mounting hole diameter: 8.7 mm.
Shaft thread: M8 x 1.25.
Rod length from mounting point: 115 mm.
Body material: Forged aluminum.
Weight savings: 50 g compared to the cast aluminum version.

Diameter identification by color

AP Racing master cylinders come with a small colored plastic clamp wrapped around the body to make it easier to identify their diameter. 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 BLACK clamp corresponding to 15.9 mm - 0.625 in - 5/8 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

Non-captive rod versions

The CP2623 range also includes non-captive rod versions, available under separate part numbers. These allow the master cylinder to be replaced without removing the pedal or lever rod. The part number CP2623-90PRM115 shown here is a captive rod version.

Replacement Parts and Repair Kit

Repair kit part number: AP Racing CP2623-90RK, sold separately.

Mounting and Connections

Check the mounting, connections, and alignment of the control unit. The 115 mm dimension refers to the length of the rod from the mounting point, not the length of the body. The shaft thread is for the mechanical connection; it is separate from the hydraulic threads.

Master cylinders are individually adjusted during manufacturing: do not interchange push rods, pistons, or internal components between different assemblies.

Photo and Master Cylinder Selection

The photo shows the AP Racing CP2623 range and is not binding with regard to the color of the identification clamp. To select the model suitable for your mounting, refer to the part number and technical specifications provided in this data sheet.

Before ordering, be sure to check the master cylinder diameter, threading, rod length, and fastening type. If you have any questions, our technicians can help you select the correct part number for your setup. Feel free to contact them.

Key Features

Forged aluminum body: 50 g lighter than the cast aluminum version.
Compact design: suitable for installations with limited space.
Short stroke before fluid supply shuts off: 0.68 to 1.09 mm.
Dual application: hydraulic brake and clutch controls.
Visual identification: BLACK clamp for the 15.9 mm diameter.

Products intended for vehicle modification for competition purposes may render their use prohibited on public roads, insofar as they significantly alter the vehicle's characteristics as specified in the type-approval certificate issued by the relevant authorities (noise level, pollutant emissions, maximum speed, tire dimensions, etc.).