Porsche 930 Brake Reservoir Cap Parts
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Based on industry averages you can expect to pay between $11.39 and $11.39 for a Porsche 930 brake reservoir cap.
What Size And Type Is The Porsche 930 Brake Reservoir Cap?
The Porsche 930 brake reservoir cap isn't complicated, but getting the size and style right matters. For all production years (’78 to ’89), the cap uses a thread size of about 45mm and screws down securely—no bayonet fit or fancy clips. Most original caps are black plastic with a yellow brake symbol. Some years included an integrated switch or sensor that links to the dash warning system; others didn’t. Don’t mix it up with a cap from the 911 SC or Carrera—the diameter and threads can be different even though they look similar. When in doubt, check your VIN or pull the old cap for a side-by-side comparison.
How Can I Tell If My Porsche 930 Brake Reservoir Cap Needs Replacing?
Watch for hairline cracks in the plastic or a cap that no longer grabs tightly when you turn it. If the rubber seal under the cap goes flat, splits, or feels dry, that’s another sign it’s time for a swap. Sticky residue around the cap means it may be leaking. An erratic brake warning light, despite correct fluid levels, points to a failing sensor (if your cap uses one). Sometimes the cap looks fine, but the fit just isn’t snug—don’t risk it. Every time you check brake fluid, inspect the cap. If anything seems off, replace it before small issues grow larger.
What Problems Happen If The Porsche 930 Brake Reservoir Cap Is Not Sealed Properly?
A loose or damaged cap spells trouble. Moisture seeps into the fluid, increasing the risk of internal rust and corrosion. You might notice your brake pedal feels soft or inconsistent. Small leaks can snowball into major pressure loss. Worse, your fluid could drop enough to trigger the warning light or diminish braking power when you need it most. Over months, this wears out the master cylinder, lines, and even calipers—repairs nobody wants. Best to fit a good cap and check it routinely. The price of a new one is always less than the cost of unsafe brakes.
Is There A Reliable Aftermarket Alternative To The Porsche 930 Brake Reservoir Cap?
It’s possible to find aftermarket caps, but tread carefully. Many cheap imports miss the fine details: wrong threads, weak seals, or a sensor that won’t work with your dash. Some look the part but don’t last more than a season. Enthusiasts often go for OEM or high-grade reproductions, especially for driven or original cars. Reputable Porsche suppliers usually list the sensor or seal compatibility in plain language. Before you buy, confirm both fit and function. Saving money upfront isn’t worth the headache of a leaking or faulty cap.
How Often Should I Check Or Replace The Porsche 930 Brake Reservoir Cap?
Check the cap every time you lift the hood—even if it’s just twice a year. If you drive hard or use your Porsche on track, take a look after every event. There’s no set timeline for replacement; signs of wear or a tired seal are what matter. If your cap is original, cracked, or the seal feels stiff, swap it out. The cost and effort are minimal compared to the peace of mind it provides. Simple checks prevent surprise issues down the road.
Why Choose AutohausAZ For Your Porsche 930 Brake Reservoir Cap?
Shopping at AutohausAZ means you’ll find the right cap at a price that makes sense. The team knows these cars—many own and wrench on classics themselves. That passion comes across in their advice and attention to detail. They don’t just stock parts, they back you up with quick shipping and a no-hassle return policy. If a cap doesn’t fit, send it back. No drama. The goal is to help you finish the job and get your Porsche back where it belongs. Genuine parts, fast service, real support—you get it all without emptying your wallet. That’s why Porsche folks keep coming back. Try them once, and you’ll see what sets AutohausAZ apart from the rest.
