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Hayes Dominion A4 Disc Brake
Hayes Dominion A4 Disc Brake
With the 4-piston Dominion A4, Hayes has developed a new disc brake especially for trail, enduro, downhill and E-MTB applications.
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.
High braking power with 4-Piston: Disc Brake Dominion A4 from Hayes
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.
Features - Dominion A4
- 4-Piston Caliper
- Cartridge-bearings used in the brake lever
- Aluminum piston operates smoothly across operating temperatures
- Piston glide ring - technology pioneered in suspension forks
- Patented Crosshair caliper alignment screws
- Allows mechanics and end users to quickly and accurately set brake caliper with no rubbing of the rotor on the pads
- Eliminates guesswork and trial and error
Product features
- Use: MTB, E-Bike
- Model: Dominion A4
- Brake type: Disc-Brake
- Lever length: 2-Finger
- Open clamp: Yes
- Caliper: 4-Piston
- Brake mounting: Postmount
- Brake pads: T106 Semi-Melalic and T100 Sintered Metalic
- Brake hose length: front 1000mm / rear 1800mm (shortable)
- Brake fluid: DOT 5.1
- Recommended brake rotor: D-Series
Mount (choose variant)
- front - left
- rear - right
Material
- Lever: Aluminum
- Caliper: Aluminum
- Piston: Aluminium for heat management
Color
- black/bronze
Scope of delivery
- 1 Brake lever
- 1 Brake caliper
- 1 Brake hose (shortable)
- 1 Olive
- 1 Insertpin
- 1 pair T106 Semi-Melalic brake pads
- 1 pair T100 Sintered Metalic brake pads
- 2 Screws for brake caliper
- Disc brake is ready for installation, completely assembled and bleeded!
Rotor and Adapter not included!
Hayes Dominion A4 Installation
Hayes Dominion A4
Hayes Dominion A4 Service
95-36115-K001
844171072981
844171072981
Hayes Performance Systems 5800 W Donges Bay Rd 53092 Mequon, WI United States https://www.hayesbicycle.com
Merida & Centurion Germany GmbH Blumenstraße 49-51 71106 Magstadt Deutschland [email protected] https://www.mcg-parts.de
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Great, powerfull and sturdy brakes. They survived many crashes.
Best brakes I’ve ever had (before the Dominion I had Sram Guide, Formula Cura 2, Shimano XT 4 pots and Magura MT7), and the Hayes are the most powerful and consistent of them all.