Making power is easy. Making power with the right feel, that was Hayes’ challenge. They did this by creating an all new system.
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 Hayes’ D-Series rotor to manage the heat with less braking noise.
Crosshair Caliper Alignment System dramatically simplifies caliper installment and alignment.
4 piston system for max power.
Dual caliper bleed ports for better bleed integrity.
Reach adjustment dial for tool less reach adjustment.
Rotor Size Compatibility
160, 180, 203mm
Adjustable Reach Lever
Brake Caliper Mount Type
Number of Pistons
Downhill, Enduro, All-Mountain
CALIFORNIA PROPOSITION 65 WARNING: This product can expose you to chemicals including (Cadmium, Phthalates, Bisphenol, Nickel (Metallic), di(2-ethylhexyl)phthalate "DEHP"), which is known to the State of California to cause cancer and/or cause birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
I'm absolutely loving the Dominions. The levers feel amazing, with little to no drag ad everything is ball bearing mounted. There's no play or looseness feeling in the levers either. Pad engagement is almost instant and modulation is incredible. Hayes really did their homework here and it shows! They also make nearly no noise which is a nice plus. Was a shimano fanboy but I am definitely a convert now.
I just started using these and so far what I've heard about them is true. Their 4 piston design has plenty of power for your long travel trail or enduro bike. They also are extremely easy to modulate. Keep squeezing and you get progressive power with no lock up, no skid. That equals amazing stopping power thats controlible. Five stars for stellar stopping performance from a company that pioneered hydraulic brakes on mountain bikes.
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