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- 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 1975-1977 3.0L Turbo (930)
The OE Match Brake Fluid Reservoir Cap is a replacement closure for the hydraulic brake fluid reservoir on classic Porsche 911 and Porsche 930 Turbo models.
Fits:- Porsche 911 1971-83
- Porsche 911 (930) Turbo 1975-77
Diagram Ref No 2
Fitted to the top of the brake fluid reservoir, the cap helps securely close and protect the hydraulic fluid supply from dirt, moisture and other external contamination. Maintaining clean brake fluid is essential for dependable hydraulic braking performance and the long-term condition of the master cylinder, brake calipers and associated hydraulic components.
Although the reservoir cap is a relatively simple component, age, repeated removal during servicing and deterioration of the sealing surface can prevent it from fitting or sealing correctly. Replacing a damaged or poorly fitting cap helps maintain the integrity of the brake fluid reservoir.
What This Product Does:
- Closes the brake fluid reservoir securely.
- Helps protect brake fluid from dirt and external contamination.
- Helps reduce unnecessary exposure of the fluid to atmospheric moisture.
- Helps prevent brake fluid escaping around the reservoir opening.
- Maintains a secure closure during normal vehicle operation.
- Protects the reservoir opening during driving and storage.
- Works with the appropriate reservoir cap seal.
- Replaces a cracked, damaged, distorted or poorly fitting original cap.
- Helps restore the original brake reservoir arrangement during servicing or restoration.
Brake fluid is hygroscopic, meaning it naturally absorbs moisture from the atmosphere. A properly fitted reservoir cap and seal help limit unnecessary contamination of the fluid.
Symptoms Of Wear Or Failure:
Possible signs that the cap requires replacement include:
- Cap becoming loose or failing to tighten securely.
- Cracks in the cap.
- Damaged or worn threads.
- Physical distortion.
- Brake fluid residue around the reservoir opening.
- Dampness or seepage around the cap.
- Damaged sealing surface.
- Cap no longer sitting squarely on the reservoir.
- Missing or deteriorated internal seal.
- Dirt or contamination visible around the reservoir opening.
- Cap becoming brittle through age.
- Damage caused by overtightening or incorrect removal.
- Original cap missing during restoration or servicing.
Brake fluid around the reservoir does not always mean the cap itself is responsible. An overfilled reservoir, damaged seal, cracked reservoir or other hydraulic issue should also be checked.
Why Replacement Matters:
The brake fluid reservoir supplies hydraulic fluid to the braking system. Keeping that fluid clean and properly contained is important for safe and consistent brake operation.
A damaged or poorly fitting cap can allow increased exposure to:
- Dirt.
- Dust.
- Moisture.
- Workshop contamination.
- Road debris.
Replacing the cap helps maintain a properly protected reservoir and reduces the likelihood of contaminants entering the hydraulic system.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91135590502
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