AP Racing Master Cylinder, Ø 20.6 mm - 5/16 in-24 UNF push rod, 135 mm

Reference: AP-CP4400-93T135

Supplier Ref.: CP4400-93PRT135E

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With its 20.6 mm bore, the AP Racing CP4400-93PRT135E master cylinder is designed for use in a hydraulic control system for braking or clutch applications in racing. It features a center-mounted bulkhead mounting and a 135 mm 5/16 inn-24 UNF threaded rod, measured from the mounting point.

The central bulkhead mounting meets the requirements of composite structures in race cars.

Its cast aluminum body features a central mounting on a bulkhead ranging from 10 to 22 mm thick. The inlet and outlet openings are located at the end of the master cylinder, away from the bulkhead, to provide clearance around the mounting area.

Technical Specifications

Brand: AP Racing.
Manufacturer Part Number: CP4400-93PRT135E.
Range: CP4400.
Actuation: Push-type.
Mounting: Center-mounted on bulkhead.
Master cylinder diameter: 20.6 mm - 0.812 in - 13/16 in.
Identification clamp color: ORANGE.
Total stroke: 25.4 mm.
Hydraulic inlet: 7/16 in-20 UNF.
Hydraulic outlet: 3/8 in-24 UNF.
Stroke before supply shutoff: 0.48 to 0.63 mm - extra short.
Partition wall thickness for mounting: 10 to 22 mm.
Shaft thread: 5/16 in-24 UNF.
Rod length from mounting point: 135 mm.
Body material: Cast aluminum.
Listed weight: 290 g.

Color-coded diameter identification

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 an ORANGE clamp corresponding to 20.6 mm - 0.812 in - 13/16 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

Replacement Parts and Repair Kit

Repair kit part number: AP Racing CP2623-930RK or CP2623-930PRK, depending on the piston version; sold separately.

Mounting and Connections

Check the mounting, connections, and alignment of the control. The 135 mm dimension refers to the length of the rod from the mounting point, not that 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 rods, pistons, or internal components between different assemblies.

Photo and Master Cylinder Selection

The photo shows the AP Racing CP4400 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 provided in this data sheet.

Before ordering, be sure to check the master cylinder diameter, threads, rod length, and fastening type. If in doubt, our technicians can help you select the correct part number for your installation. Feel free to contact them.

Key Features

Compact design.
Central mounting on bulkhead: suitable for composite structures in race cars.
Extra-short stroke before the fluid supply shuts off: 0.48 to 0.63 mm.
Hydraulic openings at the end: clearance around the bulkhead.
Visual identification: ORANGE clamp for the 20.6 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.).