Dominion A4 Header
Hayes Disc Brakes | Dominion A4 Brake - 100cm / Regular / Stealth Black / Grey
Hayes Disc Brakes | Dominion A4 Brake - 100cm / Regular / Bronze
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -
Hayes Disc Brakes | Dominion A4 Brake -

Dominion A4 Brake


Regular price$249.99
Shipping calculated at checkout.

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  • 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
•Two Sets of Pads Included. Semi Met installed Sintered in the box

•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

Dominion In The News

"The Dominion brake is a winner in every sense.. If you are in search of a good brake, start with this one"

"I was pleasantly surprised by the Dominion A4 brake and I think most riders will be as well"

"I find myself recommending these to everyone that sees them on the trail."

The Lost Co Logo

"Overall, the Hayes Dominion’s performance was very impressive indeed, descent after descent we encountered nothing but consistent and precise braking."

Enduro MTB Magazine

"if you’re chasing the hand and arm fatigue gremlins but haven’t yet experimented with more powerful, easier to use brakes, consider this an endorsement from a weak-handed man who’s now less sore at the bottom of every descent."

Rotors and Brackets not included

Get everything you need!

Hayes A Series Brakes

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

Hayes A-Series Brakes
Hayes D-Series Rotors

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.

Hayes Brake Caliper

Crosshair Caliper Alignment screws allow for quick and accurate setup.

Hayes Brake Caliper

King Pin pad retention bolt adds strength.

Hayes Brake Caliper

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

Customer Reviews

Based on 52 reviews
Joe Hoeper
Impressed - and now addicted

After hearing nothing but good things from fellow riders about these brakes - I decided to make the switch. I rode 4 other brands brakes before riding these. These A4s have the best lever feel and bite point I've experienced. The ease of the pull means I don't have to as hard during descents, minimizing arm pump. I'm converted - these are now my go to brakeset.

Travis Larsen
Good stuff

Second set. Can’t go back anything else. Wish these were spec’d on more bikes.

Laurie Citynski
Best brakes ever!

Really, these are truly unmatched in terms of power, lever feel and maintenance. I've tried most brakes on the market and I have now bought Dominions for all three of my mountain bikes. I won't shut up about how great they are to my friends, and everyone who tries them is just as enamored as I am. You won't regret buying them!


Best brakes on the market! Amazing lever feel!

Excellent Brakes

Bought these when they first came out and thrashed a pair of them on enduro and downhill for 4 years with no maintenance except occasional bleeds. The rear started to wear out finally—leaking a little at the caliper due to old seals and the master cylinder was getting a bit worn out at the pivot points. Rather than rebuilding, I bought a new rear brake and a rebuild kit for the front. I’ve never been able to run a pair of brakes for 4 years with basically zero maintenance before…really good product. Don’t require a lot of finger pressure to get max power, so they help with hand pump on long descents. The 220 rotors are also awesome if you’re a bigger rider.

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