Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit
Dominion A4 Brake Kit

Dominion A4 Brake Kit


Regular price$249.99

  • In stock, ready to ship
  • Inventory on the way

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Introducing the all-new, Stealth Dominion, our award-winning Hayes Dominion A4 brakes are back – adding even more ways for you to stop!

Dominion's master cylinder is factory tuned for the shortest dead stroke possible and a crisp bite point. The Dominion A4 caliper utilizes four pistons in the most structurally rigid design possible. It features a cold-forged caliper and KingPin structural pad retention bolt that increases stiffness.

With a motorsports-inspired Two-Stroke dual port bleed system, industry-leading DOT 5.1 fluid and Kevlar hose, the hydraulic system is engineered for ultimate performance across all temperatures and easy maintenance.

Dominion A4 features the proprietary QuickBite² system for fast and consistent burnish, coupled with our D-Series rotor to manage the heat with less braking noise.

Available in SFL (Small Finger Lever) - ergonomically tailored for the smaller hand.

•Tool-Free Reach Adjustment
•Flip-Flop Lever Orientation
•King Pin Pad Retention
•Crosshair Caliper Alignment
•Two-Stroke Dual-port bleed system

•310g (100cm hose and mount hardware)
•DOT 5.1 Fluid
•Tool-Free Reach Adjustment
•2-Stroke Dual Port Bleed System
•Sealed Cartridge Bearings Lever Pivot
•100cm Front Hose Length
•180cm Rear Hose Length

Rotors and Brackets not included

Get everything you need!

Low Input - High Fidelity (LoFi)

Low effort system with predictable, progressive ramp up and a crisp bite point.

Loaded With Tech

Reduced Friction - A featherlight lever feel is acheived through a combination of an added glide ring on the piston and sealed ball bearings at the lever blade pivot
SRL - Our Stable Rate Link delivers a consistent lever ratio regardless of reach
Precise Engagement - Each Dominion is factory set to have the lowest dead stroke possible and a crisp bite point.
Built to last - Metal pistons are used to ensure that no matter the terrain or temperature your brake will continue to perform as it did on the first ride
Adjustable Reach - Adjust your lever reach with ease while on the trail thanks to an intuive adjustment knob design

Modal Resonance Cancellation (MRC)

FEA-optimized modal shapes of D-Series rotors are intentionally designed to oppose those of Semi-Met T106 and Sintered T100 pads, canceling out noise and vibration.

Crosshair Caliper Alignment screws allow for quick and accurate setup.

King Pin pad retention bolt adds strength.

2-Stroke dual port bleed system for maximum bleed integrity.

Customer Reviews

Based on 27 reviews
Amazing brakes

I have the A4 model for a few months, I am satisfied with the purchase.

I have a doubt.

When I have to do maintenance, can I use any DOT 5.1 Fluid?

Dot 5.1 Fluid and nothing else!

Alex J.
Best brakes I've ever used, HANDS down.

There are so many places I could start with the Dominion A4's, whether it would be the incredibly consistent, powerful bite point, the feathery lever stroke (which makes going back to a pair of SRAM/Shimano's feel redundant), or their unmatched modulation, but the truth is Hayes has made a product that stands out against all the other brands in my humble opinion. Not to mention, their customer support is next to none (try getting a new master cylinder shipped out to your door in 4 days (like I did from Hayes), from Shimano. Hint: it'll take more like 4 months... Shout out Matt K. !!)

I'll never look back at another brake set again. These have changed my riding exponentially. There's a reason Remy Metailler rides them, I suggest you find out for yourself, just like I did, you won't be disappointed.


Best brakes in the business

I love these brakes, I just bought another set so that I have them on both my mountain bikes.

I am trying to love these

I have tried to reserve judgement on these brakes for the past year but it is becoming increasingly difficult. Bite point wanders all over the map based on temp and how much I am using them. I can adjust reach but it still changes mid ride.

I can’t get a new set of pads to fit without rubbing from both sides. Originally I thought they were just bled wrong. But I just worked them over again and again(full bleed 3 steps) and the pistons will not stay back far enough to prevent constant rub.

Sure the dominions feel nice but my guide R’s just work and work consistently. Can somebody tell me what the LBS and me don’t understand about getting these set up properly?

A member of our Customer Care Team will be reaching out to you to help!

Truly excellent!

I am very happy and impressed with these brakes! I had the stroker brakes many years ago and they didn't meet expectations so I wasn't in a hurry to get another pair of Hayes brakes especially since the modern line up from Sram & Shimano are real solid. Although I do like to try products that are less mainstream or your normal oem spec when they look worthwhile. So when I needed new brakes I was looking primarily towards magura. A couple people I trust strongly suggested these brakes so I went with the Dominion A4 instead. I didn't dig into the nitty gritty details and internal tech that makes these brakes special - but I was hearing that these brakes felt great, had plenty of power, and were very reliable and predictable. All of that was true! So far these are on track to be my favorite brakes to date. I usually ride a code or saint, both of which are nice and reliable. On this bike, these brakes are replacing a pair of TRP G-spec 4 pistons. The dominions are quieter, prettier, much stronger, and the lever feel (both shape and pull action) is WAY better. This is a top notch brake and I'd recommend them to anyone looking for a powerful 4-piston brake. I'm always happy to find a product that is top notch from a niche brand - especially when you're not paying boutique price. These are a win!

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