Triumph Street Twin Brakes: Unlocking Performance

Welcome to the world of Triumph Street Twins! It's an excellent choice for a modern classic, offering a fantastic blend of style and everyday rideability. Your dilemma between a well-maintained 2017 model and a potentially good deal on a 2019 model is a common one, especially when considering the notable changes Triumph introduced, particularly to the braking system. The 2019 Street Twin, with its upgraded 4-pot Brembo front caliper, certainly caught the attention of many, promising a significant improvement in stopping power and feel. But does this single change justify a potentially higher price point, especially when you're a capable wrench yourself? Let's delve into the nuances of Street Twin braking, exploring factory setups, the impact of the 2019 upgrade, and highly effective aftermarket solutions.

The Evolution of Street Twin Braking: 2017 vs. 2019

Before 2019, the Triumph Street Twin models, including your 2017 consideration, came equipped with a single 2-piston Nissin caliper at the front, paired with a 310mm disc. At the rear, a single-piston Nissin caliper worked on a 255mm disc. This setup was, by most accounts, adequate for general riding, offering sufficient stopping power for commuting and relaxed cruising. However, it often lacked the sharp initial bite and progressive feel that more performance-oriented riders desired. Under harder braking, especially from higher speeds, the lever could feel somewhat spongy, and the overall confidence in bringing the bike to a rapid halt might diminish.

The 2019 model year brought a welcome revision to the Street Twin's braking credentials. Triumph upgraded the front braking system to a 4-piston Brembo caliper, still paired with the 310mm disc. This change was a direct response to rider feedback and a clear effort to enhance the bike's overall performance and safety. The Brembo unit, known for its superior design and manufacturing quality, offers a larger piston area and more even pad pressure, translating directly into improved braking efficiency and a much more communicative lever feel. Riders immediately reported a noticeable improvement in initial bite, better modulation, and greater stopping power, contributing significantly to rider confidence.

Understanding Brake Components: Pads, Lines, and Calipers

To truly understand how to improve your Street Twin's braking, whether it's a 2017 or a 2019 model, it's essential to grasp the role of each component:

Brake Pads: The Friction Factor

Brake pads are perhaps the simplest yet most impactful component to change for immediate braking improvement. They are designed to create friction against the brake disc, converting kinetic energy into heat. Different pad compounds offer varying characteristics:

• Organic (or Resin) Pads: These are typically the standard fitment on many bikes, including the older Street Twins. They are made from a mix of fibres, fillers, and resins. Organic pads are generally quiet, gentle on the brake disc, and offer good initial bite from cold. However, they can fade under heavy use due to heat build-up and may not perform as well in wet conditions. They offer a softer, more progressive feel.
• Sintered (or Metallic) Pads: These pads are made by fusing metallic particles under high pressure and temperature. Sintered pads are known for their high friction co-efficient, excellent performance in both wet and dry conditions, and superior resistance to fade under heavy braking. They are more aggressive, provide a stronger initial bite, and typically last longer than organic pads. However, they can be noisier and may cause more wear on the brake discs over time. For performance-minded riders, sintered pads are often the go-to choice. Brands like EBC (e.g., EBC HH series) are highly regarded for their quality and performance.

Brake Lines: The Feel of Control

This brings us to your question about brake lines. Do these bikes, either year, come from the factory with metal braided brake lines? The answer for both the 2017 and 2019 Street Twins is generally no. From the factory, most modern motorcycles, including the Street Twin, come equipped with rubber brake hoses. While perfectly functional, rubber hoses have a tendency to expand slightly under the immense hydraulic pressure generated during braking. This expansion, even if minimal, translates to a slightly spongy or less direct feel at the brake lever.

Stainless steel braided brake lines, on the other hand, are constructed with a PTFE (Teflon) inner hose, reinforced by a stainless steel braid and often an outer PVC coating for protection. This construction virtually eliminates hose expansion, ensuring that all the hydraulic pressure is transferred directly to the caliper pistons. The immediate benefit is a much firmer, more consistent, and more responsive brake lever feel. You'll experience better modulation, allowing for finer control over braking force, and a more confident feel, especially during hard braking or track use. This is a relatively inexpensive upgrade that yields a significant improvement in braking confidence and performance, often making a more noticeable difference than just changing pads alone.

Brake Calipers: The Heart of the System

The brake caliper houses the pistons that push the pads against the disc. As discussed, the 2019 Brembo 4-pot caliper offers superior performance over the pre-2019 Nissin 2-pot unit. More pistons generally mean a larger contact area and more even pressure distribution across the brake pad, leading to more efficient braking and better heat dissipation. While a full Brembo caliper swap for older models is indeed available (and can be costly, as you've noted), it's important to consider if your riding style truly necessitates this level of upgrade, especially when more affordable solutions exist.

Maximising Your Street Twin's Braking Performance

Given your skillset as a decent wrench, you're in an excellent position to make cost-effective improvements. Here's how you can approach enhancing your Street Twin's braking, whether you opt for the 2017 or 2019 model:

For the 2017/2018 Street Twin (and older models):

If you choose the 2017 model, you have several avenues to significantly improve its braking without resorting to the full Brembo caliper conversion:

1. Upgrade to Sintered Brake Pads: This is arguably the most impactful and cost-effective first step. Swapping the stock organic pads for high-quality sintered pads (like EBC HH or similar performance pads from Brembo, Galfer, or SBS) will immediately provide a stronger initial bite, better fade resistance, and improved wet weather performance. This is a relatively simple DIY job.
2. Install Stainless Steel Braided Brake Lines: This is the second crucial upgrade. Replacing the front (and ideally rear) rubber brake lines with braided ones will eliminate lever sponginess and give you a much firmer, more consistent brake feel. This enhances modulation and confidence. It's a slightly more involved DIY task as it requires proper bleeding of the brake system, but it's well within the capabilities of a competent mechanic.
3. High-Quality Brake Fluid: While often overlooked, fresh, high-quality DOT 4 or DOT 5.1 brake fluid (check your manual for recommended type) can also contribute to a better brake feel. Brake fluid can absorb moisture over time, reducing its boiling point and leading to a spongy lever. Regular fluid flushes are good practice regardless of upgrades.

These two primary upgrades – sintered pads and braided lines – combined with fresh fluid, will transform the braking performance of a pre-2019 Street Twin, bringing it much closer to the feel and performance of the 2019 Brembo setup for a fraction of the cost of a full caliper swap. The total outlay for quality pads and braided lines would likely be in the region of £100-£200, a far cry from the $700+ for a caliper kit.

For the 2019 Street Twin (and newer models):

If you secure the 2019 model, you're already starting with a superior Brembo front caliper. However, there's still room for refinement:

1. Upgrade to Performance Sintered Pads: Even with the Brembo caliper, the factory pads might not be the absolute best available. Upgrading to a premium aftermarket sintered pad can further enhance initial bite and overall stopping power, fine-tuning the feel to your preference.
2. Install Stainless Steel Braided Brake Lines: While the Brembo caliper improves the feel, braided lines will still eliminate any residual sponginess from the rubber lines, providing the ultimate in lever firmness and consistency. This will truly allow the Brembo caliper to shine.

Comparative Analysis of Braking Setups

Let's summarise the potential braking performance with different configurations:

Rider Confidence and Riding Style

Ultimately, the "difference" in brake pads and lines boils down to rider confidence. When you know your bike will stop predictably and powerfully, you ride with greater assurance. This can translate to more relaxed cruising, more precise cornering, and safer emergency stops. For spirited riding, strong, fade-resistant brakes are essential. For daily commuting, a consistent and easy-to-modulate brake lever makes stop-and-go traffic less fatiguing. Considering your ability to perform the work yourself, investing in high-quality sintered pads and braided lines for a 2017 model offers an exceptional return on investment. The performance gains for typical road riding will be substantial, arguably negating the need for the full Brembo caliper conversion unless you are pushing the bike very hard on track days.

Frequently Asked Questions (FAQs)

Q: Is it difficult to install braided brake lines myself?

A: Installing braided brake lines involves removing the old lines, fitting the new ones, and crucially, bleeding the brake system thoroughly to remove all air. While not overly complex for a competent mechanic, it requires patience and attention to detail. Air in the lines will result in a spongy or non-existent brake lever. If unsure, consult a workshop manual or seek professional assistance for the bleeding process.

Q: Will sintered pads wear out my brake discs faster?

A: Sintered pads are generally harder than organic pads and can, in theory, cause slightly more wear on brake discs over the very long term. However, for everyday road use, the difference is usually negligible, and the benefits of improved braking performance far outweigh this minor concern. Ensure your discs are in good condition before fitting new pads.

Q: What's the benefit of upgrading the rear brake as well?

A: While the front brake provides the majority of stopping power (typically 70-80%), upgrading the rear brake with sintered pads and a braided line can still offer a tangible improvement. It provides better feel and control for low-speed manoeuvres and can be useful for stabilising the bike during hard front braking. It's a less critical upgrade than the front but still beneficial.

Q: How often should I change my brake fluid?

A: Triumph generally recommends changing brake fluid every two years, regardless of mileage. Brake fluid is hygroscopic, meaning it absorbs moisture from the atmosphere over time. This moisture lowers the fluid's boiling point, which can lead to brake fade under heavy use as the fluid boils and creates vapour pockets. Regular fluid changes maintain optimal braking performance and longevity of your brake components.

Q: Do I need special tools to change brake pads?

A: For changing brake pads, you'll typically need basic hand tools like wrenches or sockets, a flat-head screwdriver or pad spreader to push back the caliper pistons, and possibly a C-clamp for stubborn pistons. A wire brush for cleaning the caliper and a torque wrench for correct tightening are also highly recommended for safety.

Conclusion

The 2019 Street Twin's Brembo upgrade certainly makes a positive difference, offering superior initial bite and feel straight from the factory. However, the question of whether it justifies a higher price for you, a capable mechanic, is debatable. For a fraction of the cost of a full Brembo caliper conversion, upgrading a 2017 Street Twin with high-quality sintered brake pads and stainless steel braided brake lines will deliver a remarkable transformation in braking performance and rider confidence. This combination will provide a firmer lever, stronger stopping power, and better modulation, bringing its braking capabilities very close to, if not exceeding, the stock 2019 setup. Given your ability to do the work yourself, this approach represents excellent value for money, allowing you to enjoy all the charm of the Street Twin with significantly enhanced stopping power.

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