Flexible brake lines, braided or rubber, which is FASTER?

A conversation recently got me thinking about this. Generally, stainless steel braided brake lines are recommended 'because race car', and I get it, theoretically giving the driver more direct control of the brake pads' pressure on the disk seems like a potential performance bonus. 

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But what is the actual performance delta (in the metric that matters, the time saved to get around the track)? It doesn't seem like the advantage would be available to all drivers either, so what level of driver do you have to be to benefit? I also admit that there may be different advantages to braided lines that aren't based on lap time. Maybe they do better when everything gets smoking hot, for example. Or maybe they are easier to visually inspect for damage between races? But in this thread I'm focused on lap times. 

Has anyone actually tested braided vs rubber for time?

For me it's purely modulation; that extra bit of feedback makes it easier to be consistently aggressive with the brakes. I may have some bias as on motorcycles there was a night and day difference. On my Datsun the pedal feel also improved a lot.

I also think there is a secondary consideration on race cars as the braided lines are more resistant to damage

With modern ABS braking systems the advantage is probably less than I has a driver imagines it is.

Yeah any difference in lap time is probably too small to measure, it just makes a slight difference in pedal feel, not worth the packaging issues that come with these lines IMO. I've done them once and I think I'll stick to rubber in the future.

They can actually be harder to inspect for damage since they tend to fail from the inside-out, while rubber lines tend to fail from the outside-in.

I don't believe there is any performance advantage.  "Feel" improvements are just that "feel".

The reason I say this?  Modern performance ABS systems provide perfect multi channel threshold braking using RUBBER lines.  If there was any performance loss in the ability to detect the bite point and provide the optimum tire slip angle due to "squishy" fluctuations in line pressure caused by rubber lines they would run different kinds of brake lines.   I assume race cars run braided lines mostly for durability reasons vs pure performance.  

It would be an interesting test though to take something with really good Stability control and braking like a 911 or C8 Vette and then swap ONLY braided lines and see if there really is any improvement.  Do it both with all driver aids on and off.  

The main advantage to braided lines is you can do your brake system in -3 AN and get rid of all of the weird banjos and double flares and bubble flares, so you need to carry fewer spares and can even make your own lines at the track.

The main downside is that braided lines seem to be a lot more fragile.  When pinched or hit the braid gets damaged and the line blows out.  So you get to gain more experience making your own lines at the track.

Direct fit braided lines seem like the worst of both worlds to me.

nocones said:

The reason I say this?  Modern performance ABS systems provide perfect multi channel threshold braking using RUBBER lines.  If there was any performance loss in the ability to detect the bite point and provide the optimum tire slip angle due to "squishy" fluctuations in line pressure caused by rubber lines they would run different kinds of brake lines.   I assume race cars run braided lines mostly for durability reasons vs pure performance.  

I do wonder about the validity of comparing what a computer controlled system can achieve vs what a human can do.  Everything about the  ABS system is optimized around the rubber lines so things like the volume and frequency of each pulse will take the system compliance into account.  The human on the other hand (or foot in this case) can't move at the same speed or with the same ability to go directly to a pressure...I'm pretty sure switching to braided lines on an ABS car does nothing helpful, but I'm also pretty sure human controlled braking will be better with braided lines.

In reply to mke :

I'm not sure.  Compliance in the brake hose should be fairly linear based on the spring constant of the rubber material.   If the primary feedback for threshold braking is brake pad forces on the caliper piston then I could see an impact on human controlled braking as there would be a very slight dampening of this pressure feedback.  But I don't believe that's the case.  I believe you are generally trying to feel tire forces through seat of pants and some steering weighting and that is the feedback loop that makes you apply pressure through your foot.  I think in this feedback loop the rubber hoses are a relatively constant in the system similar to caliper flex, and general flex of the brake components.  

But it is absolutely worth a test to see.  And the comparison of computer control to human would be really interesting.

Well, 2 things strike me. 

1. It should be easy to measure the "compliance" of a rubber line per foot or line diameter or whatever. How much more compliant is a brake line than a stainless line (probably not all braided lines are created equal either)? How much more volume goes into a rubber line at a normal threshold pressure? If the real difference in compliance is small enough, there's our answer.

2. Theoretically I could see that a little compliance is actually a good thing. The ground is never flat, so the forces going into the tire are never constant, so the forces going into the wheel are never constant and so forth. That means that if you graphed the maximum threshold pressure in the caliper over time you would not see a flat line. If the rubber line has a bit of compliance in it, then you would better "average" those peaks and valleys than a line with no compliance. 

But I also know that theory is not always a good predictor of practice. Which is why I'm curious if anyone has ever tested the lines back to back for time advantages.

I think whether or not the car has ABS is an important question.  With ABS you pretty much just mash the pedal to the floor until it starts pulsing then back off a hair.  Without ABS it requires a lot more feel to brake close to the threshold without locking up.  Either way, a good driver will adapt as long as the car's behavior is consistent.  Rubber lines may feel mushier, but as long as they're consistently mushy then I don't think they're any slower than braided lines.

All of my real track experience was on motorcycles in the 90s so everything could be different now.  At the time though there was almost no such thing as a bike without braided lines...even in the production classes that was 1 of the only mods allowed because they considered the mushiness of rubber lines a safety issue...the difference in brake feel and response was just night and day. But that was then, I really don't know what is done today...which is sad 

Aeroquip style metal braided lines with PTFE inners are certainly good at improving feel over even a new regular rubber line. I am not so sure whether the reduce slowing times on the track. 

I do know that if a single one of the steel wires that make up the outer sheath breaks it can cause failure and I had one instance when there were no broken wire bits yet the PTFE liner had somehow rubbed on the inside of the braiding on a line on one of my race cars, which resulted in a pinhole leak that fortunately manifested itself when I was under the car bleeding the brakes - all of a sudden a really fine stream of fluid shot out!

I know that I prefer the feel of braided steel lines over rubber enough that I'll run them if the rules and budget allow but are they actually faster?  I don't know.  I suspect the answer is, it depends. 

Rubber lines not only increase pedal travel they also make the pad clamping pressure to pedal displacement non-linear.  On the initial pedal movement the pads move out till the contact the rotors.  Once they're in contact the pressure increases in the system linearly as the pedal if moved further until it reaches a point where the lines start to swell.  At that point continuing to move the pedal increases system pressure at a lower rate until the lines stop expanding (or the rate of expansion slows) at which point the original pedal movement\pressure increase ratio is resumed. 

It's that non-linearity that's perceived as lack of feel.  If threshold breaking requires pressure modulation in and around the range where the change in the pedal movement\pressure ratio occurs then the impact on lap times could be significant.  Otherwise it's probably just a driver comfort/confidence thing and that's harder to quantify.

Considering an upgrade to your vehicle’s brake system and wondering, “are stainless steel brake lines worth it?” These lines are often championed for their increased durability and improved braking response, potentially giving you an edge on the road or track. This article cuts through the noise to provide a straightforward look at the benefits and trade-offs, helping you make an informed decision based on actual performance gains, longevity, and your unique driving demands. Strap in as we navigate the intricacies of stainless steel over traditional rubber brake lines, without the fluff and sales pitch, while answering the question: are stainless steel brake lines worth it?

Key Takeaways

• Stainless steel brake lines enhance braking efficiency by resisting expansion under pressure, providing consistent pressure transmission, resulting in a more responsive braking system compared to standard rubber hoses.

• Constructed with a Teflon or PTFE inner core and a braided stainless steel sleeve, these brake lines are designed for durability and can handle high temperatures, making them a versatile option for various driving conditions and suitable for performance and off-road vehicles.

• While stainless steel brake lines have a higher initial investment compared to rubber hoses, their extended lifespan and improved braking performance can offer long-term benefits, but the overall value depends on individual driving needs and conditions.

Are Stainless Steel Brake Lines Worth It

Often hailed as the premier upgrade for braking systems, stainless steel brake lines are designed to boost the longevity and effectiveness of these systems by curtailing hose expansion. Their consistent performance, delivered by eliminating the expansion that occurs in stock rubber lines, makes them a popular choice among car enthusiasts.

On the track, stainless steel brake lines can enhance braking performance by maintaining a firmer pedal feel and offering better modulation due to their heat resistance. But how exactly do they achieve this? And how do they compare to their rubber counterparts? Let’s delve deeper to find out.

The Role of Brake Lines in Braking Efficiency

Your vehicle’s braking system heavily relies on brake lines. They transmit brake fluid pressure from the master cylinder to the brake calipers, which then clamp down to slow or stop the vehicle. This process is a symphony of mechanical precision that ensures your vehicle responds when you hit the brake pedal.

This process significantly involves stainless steel brake lines. Their key advantage lies in their ability to resist expansion under pressure. This ensures consistent pressure transmission, leading to a more responsive braking system. This makes them a popular choice for performance and off-road drivers who demand optimal braking performance.

Stainless Steel vs. Rubber: A Comparison of Durability

When it comes to durability, stainless steel brake lines have a distinct advantage over rubber hose. Rubber hoses can fail over time and with repeated use due to weakening, ballooning, or stretching when pressure is applied.

Stainless steel brake lines, on the other hand, offer several advantages over OEM rubber brake hose:

• They resist corrosion and endure reduced expansion, resulting in superior durability.

• They maintain their sensitivity without stretching, ensuring a more responsive braking system.

• The average lifespan of rubber brake lines is typically about six years, during which they can stretch and become less effective.

By choosing stainless steel brake lines, you can enjoy a longer-lasting and more reliable braking system.

This singular fact underscores the worthiness of stainless steel brake lines as an investment.

Impact on Pedal Feel

One of the most noticeable benefits of upgrading to stainless steel brake lines is the improved pedal feel. The installation of these lines results in a firmer pedal response, with less travel required to achieve the same braking power.

The benefits of stainless steel brake lines include:

• Non-expansive nature, ensuring a more direct transfer of hydraulic pressure

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• Resistance to ballooning, resulting in better pedal feel

• More consistent braking

• Improved pedal firmness

• Reduction in the ‘mushy’ brake feeling

These benefits have been confirmed by various drivers, including those of BMW E39 and E30 vehicles, as well as everyday and performance-focused drivers.

The Construction of Stainless Steel Brake Lines

Having underscored the benefits of stainless steel brake lines, it’s time to explore their construction. These brake lines are created using a method where the material is drawn over a die to extrude the tube form, ensuring exceptional resistance to rust and corrosion.

At the heart of their design is a Teflon liner encased in a braided stainless steel sleeve. This combination of materials delivers a unique blend of durability and reliable braking performance. But what are the practical implications? Let’s dissect this further.

Anatomy of a Stainless Steel Brake Line

The anatomy of a stainless steel brake line is nothing short of fascinating. At its core is a Teflon or PTFE tube that offers a smooth path for brake fluid and resists high pressure, essential for maintaining consistent fluid delivery. For optimal performance, it is important to use specified high-quality materials such as DuPont virgin grade PTFE for the inner core when installing these lines.

This Teflon or PTFE inner hose is encased in a braided stainless steel wire to provide rigidity and resist expansion caused by internal pressure from braking, ensuring the brake line maintains its shape. This stainless steel braided outer layer serves to add strength to the brake line and prevents any undesirable expansion of the line under the high pressure of the braking system. However, it’s worth noting that there are concerns about the longevity of these brake lines, particularly the potential of the Teflon tube being eroded by road debris that could get caught in the braided external sheath.

Pressure Handling Capabilities

Stainless steel brake lines, also known as ss brake lines, are engineered to reduce the expansion that typically occurs when under pressure, which helps to maintain consistent brake pressure to the calipers. This is a significant advantage over OEM rubber hoses, which exhibit expansion when subject to hydraulic pressure, potentially affecting the efficiency and responsiveness of the braking system.

The non-expansive nature of stainless steel brake lines facilitates a more direct and efficient transfer of hydraulic pressure from the pedal to the braking system. This means that your vehicle will respond more rapidly when you hit the brake pedal, providing you with more control and confidence in your vehicle’s braking capabilities.

Protective Coatings and Corrosion Resistance

To further enhance their durability, some stainless steel brake lines are coated with polyvinyl fluoride (PVF), which significantly increases their resistance to rust, corrosion, and environmental impacts. This is a key factor in their longevity and reliability, even under harsh driving conditions.

Quality stainless steel braided brake lines often include a rubber brake line outer coating that acts as a preventive layer against dirt and minor abrasions. To further protect against corrosion and UV rays, these lines are frequently covered with a layer of PVC, safeguarding the wire and inner hose from environmental damage. This multi-layered construction with protective coatings is a testament to the thought and engineering that goes into creating these durable and reliable brake lines.

Installation and Maintenance Insights

Correct installation and maintenance of stainless steel brake lines are vital for their optimal performance and the safety of your vehicle. While it’s possible for individuals with the right tools and confidence to fit braided brake lines to a motorcycle at home, it’s advisable to consult a professional mechanic if you’re uncertain about the installation process.

Braided brake hose kits, also known as braided hose kits, are typically designed to be model-specific, ensuring that they can be fitted without the need for modifications to the motorcycle. However, proper installation of the hydraulic brake hose assembly is just part of the equation. Let’s explore the significance of regular inspection and maintenance.

Installing Your Stainless Steel Brake Lines

When installing stainless steel brake lines, there are several key steps to ensure a smooth and successful process. First, avoid polishing old lines that may have interior corrosion despite appearing uncorroded on the outside. It’s also crucial to prevent the lines from twisting, especially when the caliper is removed, to avoid binding that may lead to line failure.

Using flare nut wrenches can secure the fittings without rounding the nuts off, providing a more reliable installation without leaks. It’s important to follow the exact sequence for tightening brake lines and be cautious not to over-tighten to prevent damage to the fittings.

After installation, a brake bleeder is necessary to properly bleed the brake calipers, ensuring that DOT specifications are met.

Regular Inspection and Care

Regular inspection of your stainless steel brake lines is a critical part of maintaining their performance and safety. Keep an eye out for visible signs of brake line issues, such as corrosion, moisture, and damage, along with dashboard warning lights indicating brake system problems.

A low or spongy brake pedal, the vehicle pulling to one side, or intermittent brake issues can be indicators of worn or damaged brake hoses. Regular inspection for wear should include checking for brittleness, sponginess, and visual signs such as cracks, blisters, or leaking. Special attention should be given to inspecting brake line fittings for leaks due to the extra stress they endure.

If brake lines are damaged or leaking, resulting in reduced brake pedal resistance or a pedal that can be pushed to the floor, they should be replaced immediately to ensure safety.

Compatibility with Upgraded Brake Systems

The compatibility of stainless steel brake lines with upgraded brake systems is one of their key advantages. These lines can handle high temperatures without degrading, making them suitable for racing applications where brake components can get extremely hot.

This makes stainless steel brake lines a versatile upgrade, suitable for a wide range of vehicles and driving conditions. Whether you’re an off-road enthusiast, a performance driver, or simply someone who values optimal braking performance, stainless steel brake lines could be a valuable addition to your vehicle.

Cost-Benefit Analysis: Making the Switch

Despite the clear benefits of stainless steel brake lines, it’s important to also factor in the associated costs. It’s true that rubber brake hoses are affordable upfront and satisfy the braking requirements for most drivers under normal conditions. However, stainless steel brake lines may offer long-term benefits and savings due to their enhanced durability.

To make an informed decision, one must weigh the necessity of upgrading against the functional adequacy of rubber hoses and the potential for cost savings over time. Do the benefits of stainless steel brake lines justify the higher initial investment? Let’s delve further into this cost-benefit analysis.

Initial Costs vs. Longevity

The upfront cost of stainless steel brake lines is typically higher than that of rubber hoses, representing a more significant initial investment. Rubber brake lines provide a less expensive, cost-effective option initially without significantly compromising on quality.

However, when it comes to longevity, stainless steel brake lines generally have a longer lifespan when compared to rubber brake lines. The extended lifespan of stainless steel brake lines can lead to cost savings over time, potentially offsetting the higher initial investment.

Vehicle owners who upgraded to stainless steel brake lines have reported that these lines tend to last significantly longer than standard rubber hoses.

Performance Enhancement vs. Standard Needs

The value of upgrading to stainless steel brake lines may depend largely on your specific needs and driving conditions. Among daily drivers, the consensus is that these lines can make the pedal feel firmer and braking more responsive, but the noticeable difference may depend on individual driving conditions and the state of the current braking system.

In high-performance vehicles that already have a high-quality braking system, like Porsches, drivers did not report a significant improvement after switching to stainless steel brake lines. However, vehicles equipped with these lines can have a better pressure versus torque relationship during braking, which implies that drivers with a focus on performance or off-road conditions might experience more pronounced benefits.

Thus, the overall worth of stainless steel brake lines for the average driver compared to those with performance or off-road vehicles varies based on existing system quality and individual driving needs.

Resale Value and Insurance Considerations

Beyond performance and longevity, upgrading to stainless steel brake lines may also have an impact on your vehicle’s resale value and insurance premiums. Installing these brake lines may increase a vehicle’s resale value by enhancing its perceived value and appeal to certain buyers.

On the other hand, modifications like upgraded brake lines can affect car insurance premiums, and it’s important to inform the insurance company of such changes. Therefore, when considering the switch to stainless steel brake lines, it’s worth factoring in these potential financial implications.

Real User Experiences with Stainless Steel Brake Lines

To accurately measure the impact of stainless steel brake lines, let’s look at the real-world experiences of those who have adopted them. User experiences with these brake lines vary, with some drivers reporting significant improvements in pedal feel and braking performance, while others notice minimal differences.

Among many drivers, there’s an acknowledgment that stainless steel brake lines can offer a more solid pedal feel allowing for improved modulation during braking. A Land Rover Discovery owner noted that after installing DOT-approved stainless steel brake lines, there was a clear enhancement in pedal firmness which benefited towing situations. What about the experiences of different types of vehicles and drivers? Let’s explore these scenarios.

From Street Cars to Off-Roaders

Stainless steel brake lines, also known as ss lines or stainless lines, are not just for high-performance vehicles. They have been successfully installed on a wide range of vehicles, from modern street cars to rugged off-roaders.

Replacing aging oem lines with stainless steel brake lines often leads to notable improvements in brake performance and pedal feel. The experiences of drivers who have upgraded to stainless steel brake lines reflect the broad applicability and enhanced braking capabilities across different types of vehicles.

Performance Drivers’ Feedback

Performance drivers often have unique needs and expectations from their vehicles, and their feedback on stainless steel brake lines is enlightening. A performance driver with a Celica experienced a significantly firmer pedal feel at the end of the stroke after installing these lines, which was particularly apparent during heavy braking on a racetrack.

However, it’s worth noting that while cup cars often use factory brake lines, indicating a possible minimal return on investment for some high-performance applications, the firmer pedal feel provided by stainless steel lines is a distinct advantage for certain driving conditions.

Everyday Driving Impressions

For everyday drivers, the experience of upgrading to stainless steel brake lines can also be transformative. Many drivers have reported that these lines improved the responsiveness of their brakes, allowing for a more immediate reaction when engaging the pedal.

Upgrading to stainless steel brake lines has enhanced the driving experience by providing a firmer pedal feel and increased confidence during routine stops. However, a minority of everyday drivers may not notice a difference in brake feel or overall driving experience in regular driving conditions after this upgrade.

Summary

As we’ve explored in this comprehensive guide, stainless steel brake lines offer enhanced durability, heat resistance, and improved pedal feel, making them a popular upgrade for performance and off-road drivers. From their intricate construction to the noticeable difference in pedal feel, the benefits of upgrading to stainless steel brake lines are clear.

However, the decision to make the switch should consider factors such as initial costs, longevity, performance needs, and potential impacts on insurance premiums and resale value. While stainless steel brake lines may not be for everyone, for those seeking enhanced braking performance and a firmer pedal feel, they present a compelling option.

Frequently Asked Questions

What are the disadvantages of stainless steel brake lines?

Stainless steel brake lines have the disadvantage of allowing small dust and dirt particles to get between the braiding and the hydraulic line, causing wear and potential leaks over time.

Is it worth upgrading to stainless steel brake lines?

Yes, it is worth upgrading to stainless steel brake lines, as they are resistant to physical damage and less likely to puncture, especially if you plan to take your vehicle off-road.

What’s the best material for brake lines?

The best material for brake lines is copper nickel, which offers improved flexibility and durability, making it a preferred choice for OEMs and maintenance facilities.

Can I install stainless steel brake lines myself?

Yes, you can install stainless steel brake lines yourself if you have the proper tools and confidence, but it’s recommended to seek professional help if you’re unsure.

How do stainless steel brake lines improve pedal feel?

Stainless steel brake lines improve pedal feel by ensuring a more direct transfer of hydraulic pressure, resulting in better pedal feel and more consistent braking.

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