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Brake Master Cylinder
By OE Match
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1978-1989 3.3L Turbo (930)
Sold each.

Fits:
Porsche 911 1986-89
Click 'Zoom in' for large parts diagram.
Diagram ref no 23
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
113945515H
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 924 2.0L 1976-79
- Porsche 924 2.0L 1980-85
- Porsche 924 Turbo 2.0L 1979-81
- Porsche 928 4.5L 1978-82
- Porsche 928S 4.7L 1981-83
- Porsche 928S2 4.7L 1984-86
- Porsche 928S4 5.0L 1987-92
- Porsche 928GT 5.0L 1989-91
- Porsche 928GTS 5.4L 1992-95
Fits into the Brake master cylinder

Fits:
Porsche 911 1974-86
Porsche 924 1976-80
Porsche 928 1978-95
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
113945515G
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 914 (1970-1976)
- Porsche 912E 4CYL 1976
Brake master cylinder reservoir (also known as a brake fluid reservoir with cap), manufactured to match original equipment specifications for classic Porsche vehicles. This reservoir holds and supplies brake fluid to the master cylinder, facilitating proper hydraulic pressure within the brake system and ensuring safe, effective braking performance.
Fits:
Porsche 911 1968
Porsche 911 1974 - 1986
Porsche 911 (930) 1975 - 1977
Porsche 914 1970 - 1976 (914-1.8/1.8V ; 914-2.0)
Diagram ref no 1.
The brake fluid reservoir sits atop the master cylinder and holds the hydraulic brake fluid needed for your vehicle’s braking system. As brake fluid levels drop during use, the reservoir compensates, ensuring uninterrupted fluid supply. Its cap seals the system, preventing contamination and fluid loss while withstanding under-hood heat and exposure to brake fluid.
Over time, brake fluid reservoirs can become cracked, brittle, or warped due to heat and constant exposure to corrosive brake fluid. A compromised reservoir can lead to fluid leaks, low brake fluid levels, and ultimately reduced braking performance or failure. Replacing it restores integrity to the brake system and helps ensure a safer, more reliable driving experience.
Replace the brake fluid reservoir when you observe any of the following:
• Visible cracks, splits, or deformations in the reservoir body
• Fluid leaks around the cap or reservoir walls
• Discoloured or contaminated reservoir plastic
• Brake fluid level dropping frequently without visible brake system leaks
• During a brake system overhaul or master cylinder replacement
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91135501313
The product you are viewing cross references to these numbers
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
Fits:
Porsche 911 SC / Carrera 3.0L / 3.2L 1977-89
Porsche 930 Turbo with servo 3.0L 1975-1977
Diameter of the bore: ø 20.64mm
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91135501112
The product you are viewing cross references to these numbers
OEMatch Brake Master Cylinder — Fit, Function, Confidence
OEMatch supplies a broad selection of parts for Porsche models, with a large catalogue of part numbers and extensive OE cross-references to support restorations and repairs. These replacement master cylinders are intended to restore reliable hydraulic control and a consistent pedal feel across road and track use.
Available Types
- Replacement units for classic Porsche restoration
- Replacement units for modern Porsche road models
- Units suited to road and motorsport preparation
Understanding OEMatch Brake Master Cylinder
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original brake master cylinder. OE (Original Equipment) refers to parts matching original specifications for the brake master cylinder and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM brake master cylinder engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models.
The brake master cylinder converts pedal pressure into hydraulic force that operates the brake calipers. It maintains even brake force distribution, supports ABS and traction control systems where fitted, and sustains a firm, predictable pedal feel when functioning correctly.
Benefits Include
- Restores safe and consistent braking performance and pedal feel
- Prevents fluid leaks and loss of hydraulic pressure
- Maintains correct brake balance across all wheels
- Constructed to resist corrosion and withstand thermal cycling
Why Brake Master Cylinder Wear and Fail
- Worn internal seals leading to pressure loss or external leaks
- Corrosion from moisture-contaminated brake fluid
- Scored or pitted cylinder bores that reduce seal integrity
- Air ingress or age-related degradation of rubber components
The Importance of Replacing with OEMatch Brake Master Cylinder
Timely replacement restores full hydraulic pressure and consistent braking response, helping to preserve control and safety for Porsche models. A serviceable master cylinder reduces the risk of spongy pedals, fluid loss and uneven brake performance while supporting systems such as ABS that depend on stable hydraulic input.
Advantages
- Manufactured to original-spec dimensions and tolerances for fit and function
- Suitable for both classic restoration and modern Porsche applications
- Supported by OEMatch’s catalogueuing and cross-references for easier part identification
Support & Advice
These items affect safety-critical systems. Installation should be carried out by a qualified technician following model-specific procedures and torque settings. Use calibrated tools and new fasteners where specified.