How to Correctly Size and Fit Performance Brake Lines in a Porsche 718 Cayman?

March 20, 2024

When you are dealing with a high-performance car like a Porsche 718 Cayman, the importance of its brake system cannot be overstated. The brake lines are the arteries of this system, responsible for transmitting the hydraulic brake fluid from the master cylinder to the calipers. It’s not just about stepping on the pedal; it’s about the precision of stopping power, the resistance to heat, and the overall performance on both the track and the open road. In this article, we will guide you on how to correctly size and fit performance brake lines in a Porsche 718 Cayman.

Assessing Your Brake System

Before you venture into replacing your brake lines, you need to inspect your overall brake system. Make sure to examine the front and rear brake calipers, pads, and discs.

A découvrir également : Can a Custom Transmission Flash Improve Shift Points in a Chevrolet Camaro SS?

For Porsche 718 Cayman, you will find a pair of 4-piston calipers at the front and a pair of 4-piston ones at the rear. These calipers clamp down on large 330 mm discs at the front and 299 mm at the rear. Porsche uses a composite disc setup, with a grey cast iron friction ring riveted to an aluminium hub. This system offers longevity, enhanced performance, and resistance to deformation under high stress.

Inspect these components for any visible wear and tear. Check the brake pads for an even wear pattern and measure the thickness of the brake discs. If the disc’s surface is uneven or the thickness is below the minimum specified, it may need replacing.

Cela peut vous intéresser : How to Upgrade the Fuel Injection System in a Classic Mini Cooper for Better Efficiency?

Understanding the Role of Brake Fluid

The brake fluid plays a pivotal role in your brake system. It’s the medium that transmits your brake pedal pressure to the calipers. Based on DOT ratings (Department of Transportation), brake fluids have different boiling points and viscosity.

The Porsche 718 Cayman uses DOT 4 brake fluid, which has a higher boiling point and is ideal for high-performance and racing applications. Always ensure to use a fresh bottle of brake fluid when servicing your brake system, as it is hygroscopic and will absorb moisture from the air, reducing its performance.

Choosing the Right Brake Line

When it comes to brake lines for your Porsche 718 Cayman, there are several available options. The standard brake line that comes fitted from the factory is made from rubber. It performs well under usual driving conditions, but under high-stress situations like racing or track use, it might expand due to heat and pressure, decreasing brake efficiency.

For high-performance applications, consider switching to braided stainless steel brake lines. These lines come with a Teflon inner hose wrapped in braided stainless steel, providing increased resistance to expansion under pressure and heat. This type of brake line offers better pedal feel and improved braking performance, especially on the track.

Sizing and Fitting the Brake Line

Now to the main aspect: sizing and fitting the brake lines. Begin by measuring the existing brake lines from end-to-end, including the fittings. Most aftermarket brake line kits will provide a range of sizes to choose from.

When installing the new brake lines, ensure to route them correctly to avoid any interference with wheel movement. Use the correct tools to disconnect the old lines and to connect the new ones. You might need to bleed the brake system to ensure there’s no air trapped in the lines, which can lead to a spongy brake pedal feel.

Maintaining Optimal Brake Performance

Once you have sized and fitted the brake lines, it’s crucial to maintain the brake system’s optimal performance. Regularly check the brake fluid level and replace it according to the manufacturer’s recommendations.

Inspect the brake lines for any signs of wear, leaks, or damage. It’s also wise to examine the brake pads and discs regularly. Replace any worn or damaged parts promptly to ensure your Porsche 718 Cayman performs at its best, whether on the open road or the race track.

Remember, your car’s braking performance isn’t just about speed and thrill. It’s also about safety. Hence, regular maintenance of the brake system is not just for performance; it’s a responsibility.

Selecting the Right Brake Kit

When looking for a brake kit for your Porsche 718 Cayman, there are many options available, but the right one will greatly depend on your driving habits. If you mostly drive on the open road, a high-performance summer brake kit might be sufficient. However, if you frequently find yourself on the race track, investing in a competition brake kit would be ideal.

The competition brake kit often includes racing calipers, high-performance brake pads, stainless steel brake lines, and superior brake fluid. It is designed to withstand the high heat and intense pressure generated during extreme performance driving scenarios.

Radi-CAL, for instance, is an innovative brake technology that offers a significant reduction in mass, improved cooling, and a reduction in deflection under load. Brake kits incorporating Radi-CAL technology can significantly improve the performance of your Porsche Cayman GTS.

The size of the brake kit is equally important. The size of the front brakes and the size rear brakes should be proportionate to ensure balanced braking. If your tire size is larger, you might need a bigger brake kit. Always consult with a professional or refer to the manufacturer’s guidelines when selecting a brake kit.


Correctly sizing and fitting performance brake lines in a Porsche 718 Cayman is a detailed process that requires a thorough understanding of the car’s brake system. From inspecting your brake system, understanding the role of brake fluid, to choosing the right brake lines, each step plays a crucial role in ensuring optimal performance and safety.

Whether you use standard rubber brake lines or upgrade to braided stainless steel ones, the ultimate goal is to enhance your car’s braking efficiency. With the right tools and guidelines, the installation process can be straightforward. However, remember to conduct regular maintenance checks, replace worn or damaged parts promptly, and always use high-quality brake fluid to ensure your car’s braking system remains top-notch.

In driving, whether on the open road or the race track, one thing’s for sure: the thrill of speed is just as important as the ability to stop precisely when you need to. And for that, your Porsche 718 Cayman relies heavily on its brake system. Hence, taking the time to correctly size and fit performance brake lines isn’t just about improving performance; it’s about ensuring safety. After all, a car is only as good as its brakes.