Press Release
Power, Perfected
Never content to leave even the best design alone, the team of engineers at Hayes sought to produce an even more extreme performance solution upon the solid and universally lauded Dominion platform. Improving upon such a respected system was to prove an arduous task, especially considering that no compromise was to be accepted on the quality or performance of the A4. The comprehensive analysis, design, and development culminated firstly into the T2 model and now the T4 (two-piston and four-piston, respectively), which offer the trademark reliability, performance, and modulation of the original Dominion platform, in an amazingly lightweight package.
The Dominion T4, just like its T2 sibling, presents the most gram-conscious rider with a zero-compromise solution at a significantly reduced weight. The Dominion T4 tips the scales at a scant 276gr per wheel, a whopping 100gr less than its A4 counterpart as a set. Such a weight reduction comes thanks to a meticulous effort to eliminate excess material and customize componentry wherever possible. Leaving the core design and functionality untouched, the T4 incorporates sophisticated and lightweight materials where possible. The most significant weight reduction is perhaps the most visible modification, or the brake lever itself. Produced by Hayes’ sister company Reynolds, the hand-laid carbon fiber levers maintain the same efficient ergonomics at a fraction of the weight. Such a light lever makes the lightest lever action on the market even lighter.
The engineering team substituted bolts, push rods, compression fittings, and banjo fittings for Titanium componentry (hence the T from the T4 moniker). The reservoir covers were replaced with composite versions along with aluminum-backed pads. The material choice for other components of the lever body or calipers could not be altered, so in order to shave additional grams, excess material was found and eliminated through additional machining. While perhaps not the lightest brake system available on the market, these weight savings make for the lightest brake system that performs up to the lofty expectations associated with the DOMINION range.
Power, Performance, Reliability
Making a lighter brake is within the possibilities of nearly all brands; however, the feather-light T4 stands out for its performance and reliability due to its Dominion DNA. The Dominion Project was carried out with no constraints in the form of timelines but rather only a lofty goal. Dominion was to be released only upon achieving a braking system that was capable of setting a new standard in addition to redefining performance. It was to stand apart from other solutions for its power, performance, and reliability but also for ease of use, consistency, and feel. It was not only to excel in each of these categories but to do so harmoniously, accepting no compromise, as a fantastically functional complete unit that was to be as reliable as performance-oriented. Hayes launched the first Dominion brake in 2018, that model, and each one to come after it, represents the same industry-leading complete performance package it did upon its introduction.
Such a successful braking solution was born from perhaps one of the most comprehensive and in-depth testing regimes ever employed for mountain bike brakes. The wealth of knowledge from such profound research and data acquisition met with the collective engineering know-how from the Hayes group, who, in addition to an extremely specialized MTB development team, boasts teams dedicated to developing solutions for motorsports, industrial, and defense sectors. The elite project found that developing a performance solution for braking would involve defining performance, a more complicated task than mere powerful braking. Simple raw power is essential for Power, Performance, and Reliability but less so than excellent modulation. The data shows that riders do much more scrubbing than actual stopping, which means finding the perfect recipe between absolute power and control. While all the secrets to such performance can’t be revealed, several technologies incorporated to establish HAYES PERFORMANCE POWER bear mentioning. When athletes need brakes, they need them immediately, and the individually calibrated master cylinder reservoir cutoff provides instant engagement via immediate fluid pressurization.
Excellent power with the lightest finger input
The STABLE RATE LINKAGE geometry of the brake lever contributes significantly to the DOMINION performance as it confers excellent power that requires a very low force application to power applied ratio. To ensure that braking force never degrades despite even the strongest force applied to the lever, Kevlar-reinforced hose resists expansion and increases overall power and efficiency. The KingPin design is a structural pad retention bolt that reinforces the caliper and thus increases power while keeping the pads in place. Dominion-level performance derives from not only raw stopping power but from creating a system that inspires greater confidence and an overall better experience in the saddle. For example, whereas most solutions from other brands use bushings to facilitate the movement of the lever, the Hayes Dominion uses sealed bearings to require as little force as possible to actuate the brake, offering best-in-class, low friction tactile feedback to the user. The piston glide ring, a technology first used in suspension forks, contributes to even smoother actuation. With both lever geometry and sealed bearings, this feature makes for an intuitive performance that has an unbelievable positive effect on the ride experience. Power, modulation, feedback, and lever feel all improve the rider experience and inspire confidence, but the brake must also conform to the riders’ physical needs and wants to feel like a perfect extension of the athlete. By incorporating a patented tool-free reach adjustment, the engineers at Hayes were able Great power with the lightest finger input to deliver one single solution that can easily be adapted to every rider’s needs. Similarly, although the Dominion is tuned at the factory for immediate pad engagement, through the use of a tool, the system can be adjusted to add the desired amount of dead stroke (how much action is required on the lever to engage pads toward the rotors) Having these two customizable options renders each set of Dominion brakes unique to each ride with a minimum amount of dialing in, and having your own personalized set of brakes increases confidence tremendously.
Performance solutions for every budget
Such performance technology and customization options are great but ultimately not worth much if you can’t guarantee consistency and flawless functionality. With this concept in mind, the decision to design the Dominion with an aluminum piston was made, as aluminum offers excellent consistency and functions smoothly across operating temperatures. The same factor played a huge role in the decision to use DOT 5.1 as it is viscosity-stable across the operating temperature range in addition to having the highest wet boiling point of all bicycle brake fluid options available on the market. DOT 5.1 is also perhaps the most regulated brake fluid on the planet, found on every corner of the globe, and is consistent from region to region and brand to brand. In other words, no matter where in the world you find yourself or what brand of fluid you find, your performance is guaranteed as no variables are present amongst DOT 5.1 offerings. Nothing says consistency like a Lifetime Leak-proof Warranty, and Hayes are proud to offer one as a testament to their confidence in such a well-engineered product. The double bleed port, Two Stroke, on the caliper allows for caliper-only bleeding and is paramount in guaranteeing a highly functional system, free from any impurities or air. This bleed-over (no pun intended) from the Powersports sector highlights the competitive advantage of having a large-scale research and development department that operates on diverse applications. The last ingredient in flawless performance was to guarantee the perfect interface between caliper/pad and rotor. Performance solutions for every budget Unique to the cycling industry, the Dominion includes two adjustment grub bolts to allow finite caliper adjustment. CrosshairTM technology makes the mechanics’ job much easier and ensures excellent alignment and, consequentially, unrivaled precision functionality. While speed might be the most alluring part of the performance, absolute control is what permits you to push limits further. The Dominion range of brakes was introduced to create a braking solution that not only makes faster and more confident riders but also represents a new standard for 360-degree quality product design. The all-new Dominion T4 is merely the latest in a family of Dominion brakes that continues to amaze athletes worldwide. Build them onto your bike and see how not only your ride changes but how your riding improves with it.
- Front or Rear brake: $324.99
- Brake Pads: $38.99
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