It’s spent several years data-logging braking habits and then developing … Hayes says their geometry has been carefully designed to mitigate noise and vibration, and apart from the brief bursts of noise when resuming riding on hot brakes described above, they’ve been fairly quiet overall, including when wet. The lever feel is outstanding (especially for my preferences), power is abundant, and they’ve been completely reliable and consistent throughout six months of hard use. The Dominion isn’t just an excellent brake from Hayes, in my opinion, it’s now one of the best trail/enduro brakes on the market – regardless of brand. And apart from a quick lever-end bleed when I trimmed the hoses upon installation, all I’ve had to do to them is swap pads as they’ve worn out. Contact-point adjusters work by changing the distance between the seal and the timing port when the lever is at its resting point (i.e. Quick view Choose Options. Jed has a documented history of finding creative ways to break things, 5-Ski Quivers: Reviewers’ Selections (20/21), Front, uncut hose: 291 g (no adapter or rotor), Rear, uncut hose: 326 g (no adapter or rotor). But if you absolutely insist on backing it off, there is a small screw hidden behind the lever blade to fiddle with. I tested the A4 brakes with the standard lever and it is substantial, with a fairly large, flat, dimpled face and a deep hook that a single finger nestles into securely. Extremely sensitive modulation doesn’t tend to be at the top of my list of priorities when it comes to brakes — I’m far more likely to find a brake lacking in terms of outright power than modulation. On a few occasions, when I’d been riding an extended, steep descent and gotten the brakes quite hot, if I took a short break but resumed riding before the brakes had a chance to properly cool down, they’d make a lot of noise and offered significantly reduced performance the first time I really got on them hard after resuming riding, which I’d attribute to them glazing over slightly. But I've heard that the A4 caliper is a strange shape that requires their own Hayes caliper adapters. Features 4-piston brake designed for trail, enduro and DH use. As has been noted widely (by myself and others) for years, Shimano has really struggled to get their brakes to maintain a consistent bite point. At the lever end, the Dominion A4 brakes that I’ve been testing feature a symmetric lever body (no need to swap hoses depending on your preferred brake orientation); a tool-free reach adjuster; and a split clamp with options for SRAM Matchmaker and Shimano I-Spec II compatible mounts, in addition to a conventional standalone clamp (tested). Speaking of the lever blade, Hayes goes so far as to offer two versions of it — the “Standard” version, and an “SFL” or “Small Finger Lever” version, meant for riders with smaller hands who run their levers closer to the bar. Until the timing port is closed off, all that squeezing of the lever does is push fluid back into the reservoir in the lever, rather than down the line and to the caliper, since it follows the path of least resistance. Hayes Dominion A4 Disc Brake ... QuickBite2 specific pad compounds paired with the Hayes D-series rotors deliver fast, consistent braking performance across all temperature and speed conditions; Hayes … Going in for a quick stab of brake and having it go to the bar is, to put it mildly, disconcerting, and I’ve given up on running Shimano brakes on my personal bikes for that reason. Hayes Dominion A4 is brake with tons of power and modulation. Dominion A4 features the proprietary QuickBite² system for fast and consistent burnish, coupled with Hayes’ D-Series rotor to manage the heat with less braking noise. The Hayes Dominion is another option in a sea of great four-piston brakes like the Magura MT, Formula Cura4, Shimano Zee/Saint/XTR/XT, and SRAM Code. The A4’s feel is much closer to Shimano Saint brakes than SRAM Code brakes (Codes have a much more linear and gradual ramp-up in firmness). This held true for the Dominion pads as well, though the semi-metallic T106 pads do have better than average wet-weather performance for a semi-metallic offering, and greatly exceed most organic pads on that front. ... SRAM adapters can have the right internal clearance but wrong rotor … 02-22-2020 #4 Phoenix864 The Hayes Dominion A4 goes for $230 per wheel without rotor or adaptor. What that means is that contact-point adjusters create a section of the stroke where the brake doesn’t do anything. Tipp. The Dominion A4, on the other hand, has been absolutely dead consistent in my time with them so far. I did notice a little quirk of the T100 sintered pads. The A4 Dominions have always sounded great though (the crosshair alignment thing is pure genius), but living in Euroland I haven’t seen these brakes in the wild yet…, I definitely get the appeal of a contact point adjuster in theory, I just don’t think that their promise is borne out very well in practice. The D-Series rotors are 1.95 mm thick and are available in 160, 180, and 203 mm diameters with six-bolt mounting. ... Hayes Front Adaptor to 51mm I.S. The Hayes Dominions are absolutely excellent brakes. The Hayes bleed kit is really nice. Designed with a specific lever pull curve to balance on-demand pressure modulation, providing firm engagement between the pads and rotors… The Dominion family features three models: The A2, A4 (tested), and the recently released T2. The rotors are 1.95mm thick and were designed specifically to cancel out any … Name Review Subject … This allows them, in part, to compensate for things like pad wear and thermal expansion of the brake fluid, as well as having a greater volume of brake fluid available to better transfer heat out of the system. The Dominion’s master cylinder is factory tuned for the shortest dead stroke possible and a … Hayes lost the plot a little bit in subsequent years and their popularity waned, but after a hiatus from the mountain bike brake market, they’re back with the Dominion line of brakes. The Dominion A4 brakes can be ordered with either lever blade installed, and both are also available aftermarket if you’re inclined to experiment (or just happen to break one). Caliper construction on the Hayes Dominion A4 utilizes a two piece aluminum body and four pistons to grip onto their D-Series Rotor. The Dominion’s master cylinder is designed with an extremely short dead stroke and with its revised cam profile when the pads contact the rotor, it comes with a crisp bite point. I don’t think I’ve hit the levers massively hard in my time with them, but I have crashed with them a number of times, and apart from some minor cosmetic scuffing, they’re no worse for the wear. The A2 and A4 share the same lever but have different calipers, with two and four pistons, respectively. DOT 5.1 Oil fluid. The SFL is thinner, shorter, and shaped to be run closer to the bar. Hayes argues, and I agree (for the reasons stated in the previous paragraph), that there’s no good reason to move it from there. A4 works great but I do have some wandering bite point – may air in the system? It would require a major overhaul of how the caliper works, since in typical brakes the geometry and material properties of the piston seals are what control the rollback. The Hayes Dominion A4 is an all-new four-piston brake system designed for trail, enduro, downhill, or eBike use. Juscycling Resin Organic Semi-Metal Brake Pads for Hayes FX-Mag HMX MX1 MX-1 Hayes 9 HMX-2 HFX9 Mag MX,Smooth Braking,Low Noise, Long Life, Kevlar, Copper, 2 Pairs 4.5 out of 5 stars 55 … For a better experience, please enable JavaScript in your browser before proceeding. The British-made Hope Tech 3 MSRP is just $20 more than that of the Dominions. I’m currently running Code RSCs which I am honestly really happy with and it has a pad contact adjustment which feels like it is doing what I want, but the above discussion about bite point kinda has me second guessing everything I thought I knew about the universe up till now. I wouldn’t mind if the lever blade was a little slimmer, with less of a broad, flat contact surface, but it’s a minor gripe and didn’t give me any real trouble. The Dominion family features three models: The A2, A4 (tested), and the recently released T2. With an extremely light lever-action and immense stopping power, the Hayes Dominion A4 are a great choice for aggressive enduro and downhill riding. Hayes absolutely dominated the disc brake market at one time but lost that lead in a big way. Nice packaging, nice syringes, and nice fittings. Joining the master cylinder to … 1 review for Hayes Dominion A4 disc brake black/bronze with an rating of 5 points. The A4’s total lever stroke is, if anything, slightly on the shorter side for a big, four-piston DH brake. The A4 caliper also features what Hayes calls “Crosshair Caliper Adjustment,” which is, in essence, a pair of set screws on the brake-mount tabs that push against the brake mounting bolts and make it easier to fine-tune the caliper alignment. Thanks! But I’ve found the dropoff to be well within the normal range, and they’ve been quick and easy to get up to temperature, even in fairly cool ambient temperatures, with a 203 mm front / 180 mm rear rotor combo. Hayes Dominion A4 Brake Teardown. DH-oriented brakes often have slightly longer strokes than lighter-duty brakes, due to the higher leverage ratio required to get more power from the brakes. When you squeeze the brake lever, the lever piston moves past the hole connecting this reservoir to the brake line (called the “timing port”) and closes it off. It’s a great idea, and, of course, you don’t necessarily need to use both — you can always do a more standard bleed procedure through one of the ports, but the other one is there if you need it. Kind of misleading when product title says, "Hayes Dominion A4 w/ 180mm Rotor Rear Hydraulic Disc Brake", but doesn't actually come with a 180mm rotor. … MSRP: $230 per brake, without rotors or adapters, Bolted to: Guerrilla Gravity Smash and Guerrilla Gravity Gnarvana. The caliper also features Hayes’ two port bleeding … Hayes admitted that the Dominion was not the lightest brake out there, but compared with Shimano XT and SRAM Guide RSC (both use aluminum lever blades) it is competitive. Clark's. If there was a realistic way to make one that varied the amount of piston rollback at the caliper, that would be sweet, but it’s going to take someone more clever than me to figure out how to actually make that happen. >>> The best mountain bike disc brakes. Price. That said, it has a couple of unique features designed with serviceability in mind. And tool-free adjusters tend to be bulkier, heavier, and more exposed to being damaged in a crash, but the Dominion’s version is quite neatly integrated into the lever blade. 3 bleed ports, so you can really flush out any air if it gets in there. The lever pivots on a pair of sealed cartridge bearings and has remained smooth and free of play in my time with the brakes. The rotors are 1.95mm thick and were designed specifically to cancel out any … Rather, it allows the factory to fine-tune the position of the seal to set it as close to the timing port as possible, to compensate for manufacturing tolerances and so on. The A2 brakes are intended for XC and Trail bikes, with the bigger A4 brakes meant for use on Enduro and Downhill bikes. And since a contact-point adjuster can only make the total lever stroke longer than the “default” position, all they can do is push the starting point of the lever farther out from the bar, at a given final bite point. I generally prefer brakes with short strokes and firm bite points, and the A4 perfectly hits the mark in those regards. Compared to Shimano Saints, the top-end power of the Dominion A4 is a touch less strong, but only just. JavaScript is disabled. Hayes Dominion A4 Disc Brake Pads, Sintered T100. The Dominions do, technically, feature a contact-point adjuster, but it’s not meant to be changed by the user. Contact-point adjusters tend to get marketed as letting you set the position that the brake lever engages, but I’d argue that reach adjusters already do that. Though the A4’s bite point hits hard in terms of lever feel, the power doesn’t come on in such a binary on / off manner. I have the A4 and love them. Swapping caliper seals to fine tune isn’t exactly practical…. w/ 20mm Axle, 8" rotor. I was recently on a ride with K2 / Line Skis designer Jed Yeiser, where he crashed and broke one of his own Dominion A4 levers at the clamp. The lever feel of the Dominion A4 brakes is exceptionally light in the early stroke and ramps up quickly and firmly upon reaching the bite point. ‘Crosshair’ … I’ve gotten along well with their recent four-piston brakes (having mostly spent time on Saint, XT, and XTR brakes) when they’re relatively new and working well. Caliper adapters for Hayes Dominion A4 Looking at picking up a set of Hayes Dominions for my bike. Rating Required. The Dominion family of brakes all use DOT 5.1 fluid and feature newly revised, Kevlar-wrapped hoses that Hayes says are stiffer than before, reducing sponginess in the brakes by reducing their expansion under pressure. I’ve been testing their four-piston Dominion A4, a brake intended for Enduro and Downhill bikes, and it is outstanding. Hayes Dominion A4 Disc brakes, front and rear. Hint for breaking-in: New disc brake pads require a … But the Dominion A4 is definitely easier to modulate than Saints, especially when using the A4’s semi-metallic T106 pads. To go with the Dominion brakes, Hayes released a revised rotor design, which they call D-Series. Preferences on lever feel are undeniably subjective, and riders who have found themselves getting along better with brakes with a less abrupt bite point might not be best served by the Dominion A4. Durability has been good on other fronts as well. Hayes was one of the first brands to offer a hydraulic disc brake for mountain bikes, and their HFX-9 and HFX-Mag brakes were everywhere in the early 2000s. But they’ve inevitably developed issues with the bite point wandering at random after a period of hard use. Historically I've been a cheap syringe and piece of tubing attached to whatever fitting I need kind of guy, but between Formula and Hayes… Having dominated the disc brake market in the late 2000s with the HFX, Hayes has been in the wilderness for a while. Modern hydraulic disc brakes for bikes operate on a semi-open system, meaning that the lever features a reservoir of “extra” hydraulic fluid that’s connected to the brake line when the lever isn’t being squeezed. There’s notably not a contact-point adjustment (at least not a typical one), since Hayes argues that they’re a bad idea, and I couldn’t agree more. The Dominion four-piston hydraulic disc brake has been developed for the rigors of DH and enduro riding provide. D-Series Brake Rotor $46.99. Clarks Sintered MTB Disc Brake Pads $7.99 ... Hayes Hayes Dominion A4 Disk Brake. Lever with ball bearing main pivot. As with most metallic pads, the T100 sintered pads do work best when they’re warmed up a little bit — braking power does suffer when they’re truly cold. You can see the timing port of the A4 in the cutaway image below — it’s the little, tapered hole at the edge of the lever seal (black) in the bottom right corner. The Dominion A4 does feature a tool-free reach adjuster. That means they invested serious R&D time in their Dominion comeback brake and it’s been worth it. Where the lever feel of the Dominion A4 really differs from Shimano Saints (and Shimano brakes in general) is in terms of consistency. I tend to prefer a simple screw for reach adjustment, since reach tends to be pretty set-and-forget as long as your brakes are working properly. But for longer-travel bikes and / or bigger riders that need serious braking power in a reliable package, the Dominion A4 is excellent. I tend to prefer metallic pads to organic and semi-metallic versions since metallic pads generally offer more power and better wet-weather performance, at the expense of a bit of noise and sometimes a little less modulation. They’re a bit heavy and probably overkill for lighter Trail duty (Hayes offers the Dominion A2 and T2 for that role). But we were able to cobble it together well enough with a Voile strap to be useable, and Jed has a documented history of finding creative ways to break things (skip to 13:24 for the relevant bit), so I’m not inclined to hold this one against the brakes. Shop Hayes … That gets you a stated weight savings of 50 g per brake (and a price increase of $60 per wheel). But for my preferences, they’re fantastic. Hayes Performance Systems manufactures the highest quality brakes, suspension systems, wheels and components for all mountain bikes, including enduro, downhill, cross country and dirt jumping bikes. Aftermarket versions of the Dominion A4 brakes come with two sets of brake pads, in sintered metallic (Hayes calls these “T100”) and semi-metallic (“T106”) versions. … Mine are incredibly consistent, but took what felt like days of bleeding. New. The Dominion A4 brakes from Hayes are a 4-piston system that leans hard toward the modulation side of the game, though the power ramps up far more than some of the hyper-modulating … First, unlike most brakes, which have a single bleed port at the caliper, the Dominion A4 brakes have two (one on each side), which Hayes refers to as “2-Stroke.” The idea is that the second port makes it easier to get every last air bubble out of the caliper, since the small passages between the two halves of a caliper can trap bubbles, and having a bleed port on each side makes it easier to draw them out. We use cookies to ensure that we give you the best experience on our website. It’s a simple system that works well, and makes fine-tuning the caliper alignment much easier. I'll be putting on a 203mm rotor on the front and 180mm on the rear. Of course, they can’t move the seal past the timing port, or the brakes wouldn’t operate properly — they can only open up a gap between the two. At £44.99 the standard D-Series steel rotor … The A2 and A4 share the same lever but have different calipers, with two and four pistons, … If you back off the screws, push the caliper inboard with one hand, and then tighten the screws with the other, you can accurately align both ends of the caliper and then tighten down the main mounting bolts to secure it. Finding my ideal DH brake seems like a never ending quest and I always thought I wanted an adjustable bite point to my brakes. Hayes disc brake adaptors are required for all Hayes brakes with the exception of 74mm post-mount forks and 160mm rotors… For further reference, a SRAM … I absolutely love the lever feel on the Dominion A4. 180mm Hayes D-Series Rotors. They’d quickly settle back in and resume normal performance, and despite that slight downside, I generally prefer the T100 pads for their overall improved power. Hayes Components Dominion A4 Brake 2019 At A Glance I’ll be honest, the last time I rode a bike with Hayes brakes was probably back in the early 2000s on the original Hayes HFX9’s (remember those?) To save you buying stuff you don’t need, it’s also available without rotors and adapters. The new T2 is essentially an A2 on a diet — the T2 gets titanium hardware, a carbon-fiber lever blade, aluminum-backed pads, a bit of extra machining on the caliper, and it loses the tool-free reach adjustment. Now that I’ve spent significant time on the Dominion A4, I think it’s safe to say that this is the brake that Hayes needed had to produce. The calipers and levers got some massive overhauls, but Hayes also developed an entirely new rotor around the new brakes. To Hayes, the Dominion is a pull-the-goalie fight … Bleed the calipers, bleed the system….it all works very well and is very maintenance free after getting that done. Put simply, the Hayes Dominion A4 brakes are my current benchmark for a burly, four-piston Enduro / Downhill brake. Whenever brakes had lacked this adjustment, I found that fiddling with lever reach sort of helped but at the expense of lever position, especially on long descents when things really heat up and expand. @Niki they should be offensively bitey….at least they are for me. Exceptional modulation throughout lever stroke, Modulation gives great control over brakes, Burly construction means no brake damage worries if you crash, Stiffer brake hose and thicker rotors make sense for gravity orientated application, Crosshair screws on caliper make centering easier, Lever modulation lacks consistency during extended descents, Had to reset pistons and/or bleed system to address above issue. The calipers and levers got some massive overhauls, but Hayes also developed an entirely new rotor around the new brakes. The Dominion A4 caliper is a mostly conventional design: two-pieces, four-pistons, and with a pivoting banjo fitting for the brake line to allow for adjustment of the hose routing. I’ll explain (but if you don’t feel the need to get into the nitty gritty, keep scrolling). The Dominion A4 master cylinder is factory tuned for … not being squeezed). Only once the timing port is closed does the brake start to move fluid through the hose to the caliper, and build pressure to provide braking force. And while the lever feel between the two is fairly similar in terms of a light initial stroke (the Dominion A4’s is even lighter) with a quick transition into a firm bite point, the power delivery of the Dominion A4s is notably more linear. 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