In most stock cars, these hoses are made of synthetic rubber. They are affordable, flexible, and perform their function for normal use. However, under high-demand conditions—such as in a sports car or aggressive driving—these rubber hoses have a significant limitation: they expand. When the brake fluid heats up or pressure increases, the rubber tends to slightly expand, absorbing part of the force that should be directly transferred to the calipers.

This is where metal brake hoses come into play. Unlike rubber ones, they are made of an inner tube of Teflon (PTFE) covered by braided stainless steel mesh. This metal coating is the secret: it is virtually non-expanding.

When pressure is applied to the braking system, this steel braid prevents any dilation of the hose, ensuring that 100% of the hydraulic pressure reaches the brake calipers. The result is a more direct, precise braking feel with an unmatched pedal response.

Technical Benefits of DASH-3 Metal Hoses

The metal hoses, specifically the DASH-3 standard we use at SDT Brakes, offer very clear and perceptible technical advantages that go beyond a simple aesthetic improvement. These benefits directly translate into better performance and increased safety for your sports car.

Improved Pedal Feel

This is perhaps the most notable benefit and the one most appreciated by sports drivers. By eliminating hose expansion, brake fluid pressure is transmitted instantly and completely to the calipers. This results in:

• Greater firmness: The pedal feels more solid and less spongy.
• More direct response: Braking is immediate and linear, with no delays or loss of force.
• Better modulation: You can dose the braking force with much greater precision, which is vital for optimal control in extreme or circuit situations. This feeling allows you to better sense the grip of the tires and avoid wheel lock-up.

Reduction of System Heating

Although hoses are not the main heat source in the braking system, their composition does influence how heat is dissipated and transmitted to the brake fluid.

The internal Teflon of the metal hoses is less prone to absorbing and retaining heat than rubber.

The stainless steel mesh, while not an active heat sink, helps maintain the structural integrity of the hose at high temperatures, preventing excessive heat expansion that could worsen fading.

By preventing expansion, the system's extra work is reduced, which can marginally contribute to a lower overall increase in brake fluid temperature, extending its lifespan and delaying the vapor lock phenomenon.

Greater Wear Resistance and Durability

Rubber hoses are susceptible to various factors that degrade them over time:

• Material aging: Rubber hardens, cracks, and becomes brittle over the years, with temperature fluctuations and exposure to external agents.
• Impact and abrasion: They are more exposed to damage from stones, road debris, or friction with other components.
• Swelling from fluids: Certain types of brake fluid or contaminants can cause the rubber to swell and degrade internally.

The metal hoses, thanks to their construction with Teflon core and stainless steel braided mesh, are inherently more resistant:

• Protection against external agents: The steel braid offers excellent protection against abrasion, cuts, and impacts.
• Temperature and pressure resistance: They maintain their structural integrity and properties under much higher temperature and pressure conditions, making them ideal for intensive and sporty use.
• Longer lifespan: Although they may be more expensive initially, their durability and resistance to degradation often compensate for the investment in the long run, reducing the need for frequent replacements.

In summary, investing in metal brake hoses not only enhances the performance of your sports car but also contributes to the safety and reliability of your braking system.