Hayes Dominion A4 Brake

Introducing the all-new Hayes Stealth Dominion. The 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 utilises 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.

A featherlight lever feel is achieved through a combination of an added glide ring on the piston and sealed ball bearings at the lever blade pivot. Their Stable Rate Link delivers a consistent lever ratio regardless of reach and each Dominion is factory set to have the lowest dead stroke possible and a crisp bite point.

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. For those really epic, pad-chewing adventures, you can adjust your lever reach with ease while on the trail thanks to an intuitive adjustment knob design.

The crosshair caliper alignment design is unique to Hayes and allows you to fine-tune your caliper alignment over the rotor by using grub screws in the caliper body that push on the mounting bolts. This is a great way to prevent even the slightest pad rub from driving your mates insane.

Who is this item for: Riders wanting high power braking that is consistent and reliable. A fast bite point and light lever feel are trademarks of the Dominion A4. Suitable for all MTB applications but aimed at gravity-oriented riding where stopping is everything.

Requires Hayes Bake Mounts as other brands won’t provide enough clearance for the shape of the caliper.

How many pistons: 4 Pistons

Material: Cold forged and machined Aluminium caliper and lever body.

Adjustment: Tool-free lever reach adjustment, Hayes Crosshair caliper alignment system using grub screws on the mounting bolts to align the caliper to the rotor.

Brake Type/Fluid: DOT 5.1 Brake Fluid

Are the brakes bled? Hayes Dominion A4 comes pre-assembled and bled

Which Pads: Hayes Dominion A4 Sintered T100 or Semi-Metallic Organic T106

Mount: Post Mount standard

Hose Length: The front brakes come with a 1000mm hose. The rear brakes come with a 1800mm hose.

Weight: 310g (front including hardware)

Note: Requires Hayes Bake Mounts as other brands won’t provide enough clearance for the shape of the caliper. as other brands won’t provide enough clearance for the shape of the caliper.