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Reservoir / Tank
By OE Match
- 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 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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
- Porsche 914 (1970-1976)
- Porsche 912E 4CYL 1976
Brake Fluid Reservoir Cap Seal
High-quality replacement brake fluid reservoir cap seal designed for classic Porsche 911 (1968–1986), Porsche 914, and Porsche 928 models.
This gasket fits inside the brake fluid reservoir cap,
providing a secure seal to prevent fluid leakage and protect the braking system
from moisture and contamination.
Fits:
- 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 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- 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
- Porsche 914 (1970-1976)
- Porsche 912E 4CYL 1976
Diagram ref no 3
Manufactured to OEM specifications, this seal ensures reliable performance and is an essential component for maintaining proper brake system function, especially on classic and air-cooled Porsche models.
Key Features
• Direct replacement brake fluid reservoir cap seal
• Fits inside reservoir cap for secure sealing
• OEM-style fit and performance
• Helps prevent brake fluid leaks and contamination
• Durable material for long-term reliability
• Ideal for maintenance and restoration
Function and Purpose
This cap seal ensures a tight closure of the brake fluid reservoir.
It helps to:
• Prevent brake fluid leakage
• Protect system from moisture ingress
• Maintain correct hydraulic pressure
• Preserve braking system performance
Why Replace Your Brake Fluid Cap Seal
Over time, seals can degrade due to exposure to brake fluid and environmental conditions.
Common issues include:
• Cracked or hardened rubber
• Fluid seepage around the cap
• Moisture entering the system
• Reduced braking performance
Replacing the seal helps maintain safe and reliable braking.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90135590800
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 356C 1963-65

Fits:
Porsche 356 C 1.6 01/63-12/65
Porsche 911 2.0 01/63-07/67
Porsche 912 1.6 01/65-07/67
Click 'Zoom in' for large parts diagram
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
69535501300
The product you are viewing cross references to these numbers
OEMatch reservoir tank — Fit, Function, Confidence
OEMatch reservoir and tank components for Porsche models support the hydraulic systems that control braking and clutch operation. By providing stable fluid storage and helping to maintain system balance, these parts contribute to consistent, predictable control in everyday driving and more demanding use.
- Hydraulic reservoirs for brake fluid circuits
- Clutch fluid tanks
- Expansion-style tanks for combined applications
- Units for classic and later Porsche models
Understanding OEMatch reservoir tank
OEM (Original Equipment Manufacturer) parts are made by the same company that produced your Porsche’s original reservoir tank. OE (Original Equipment) refers to parts matching original specifications for the reservoir tank and may be supplied by alternative manufacturers. Aftermarket parts offer alternative options, sometimes with enhanced features or better value. OEMatch supplies non-OEM reservoir tank engineered as direct-fit alternatives to OEM parts, made to original-spec dimensions and tolerances for Porsche models. Hydraulic reservoirs and tanks form the fluid store for brake and clutch circuits, supplying the master cylinder with the fluid volume it needs to maintain line pressure. They allow for expansion of fluid as temperatures change, help prevent over-pressurisation, and are designed to minimise air entering the hydraulic system. Many owners search for genuine or OEM reservoir tank; these are direct-fit alternatives designed to match the original form, fit and function. In a Porsche application, a sound reservoir supports stable pedal feel by helping keep fluid free from excess aeration and by maintaining an appropriate reserve volume above the feed ports. Caps, seals and hose spigots on the tank contribute to keeping the system closed to moisture and external contamination.
- Supports stable hydraulic fluid level for brake and clutch systems
- Helps maintain pressure balance under changing temperatures
- Designed to limit air entry into hydraulic circuits
- Assists in reducing contamination when used with correct caps and seals
- Supports predictable pedal response during varied driving conditions
- Offers a practical replacement option when original equipment is worn or damaged
Why reservoir tank wear and fail
- Age-related hardening of plastic leading to cracking or loss of flexibility
- Exposure to heat and engine-bay vibration stressing seams and mounting points
- Chemical effects of old or contaminated hydraulic fluid on internal surfaces and seals
- Weakened hose connections that begin to weep or leak under pressure or movement
- Clouding or discolouration making fluid levels harder to observe accurately
- Cap deformation or seal fatigue that can allow air or moisture ingress
The Importance of Replacing with OEMatch reservoir tank
Replacing a tired or damaged reservoir on a Porsche helps preserve both braking and clutch consistency. When the tank maintains the correct fluid volume and supports a closed, dry hydraulic environment, it reduces the likelihood of fluid loss, aeration or contamination affecting pedal response. Using a reservoir engineered to original-spec dimensions for consistent performance allows existing pipework and hoses to connect correctly and helps keep fluid level monitoring straightforward. For owners maintaining older vehicles as well as regularly driven models, a sound reservoir is a relatively simple way to protect more complex downstream hydraulic components.
- Supports reliable hydraulic operation by providing stable fluid storage
- Helps reduce the risk of air ingress that can lead to a soft or inconsistent pedal
- Assists in keeping fluid condition under control by supporting proper sealing and venting
- Made to original-spec dimensions for consistent performance
- Compatible with factory systems and sensors were fitted
- OEMatch focuses on reservoir and tank items suited to Porsche hydraulic applications
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.