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Dominion A4 Brakes (Hydraulic)

Hayes Dominion A4

Making power is easy.  Making power with the right feel, that was Hayes' challenge.  Hayes 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.  It features a cold-forged caliper and KingPin structural pad retention bolt.

With a motorsports inspired Two-Stroke dual port bleed system, industry leading DOT5.1 fluid and Kevlar hose, the hydraulic system is engineered for ultimate performance 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.

Hayes Dominion A4 FeaturesHayes Dominion A4 FeaturesHayes Dominion A4 Features

Set Descending Direction

5 Item(s)

  1. Hayes Dominion Bronze Brake Set Front

    From: US$298.03

    To: US$372.78

    Hayes' award winning Dominion brake
    Available as A4 (4 piston) or A2 (2 piston)
    Bronze lever & caliper with black lever body
    Optional add-on here if you want Limited Edition Hayes Purple levers instead of the bronze levers
    Front set with shorter (100 cm) hose
    Piston caliper with cross-hair alignment
    Flippable lever with tooled reach adjustment
    Option of Regular (BFL) or Small Form Lever (SFL; designed for smaller hands)
    Small Form Levers are designed for anyone with smaller hands (not just junior riders) - Ellen at Shockcraft/Biken uses SFL on her Dominion brakes
    Dead stroke is factory set
    Lifetime Leak-Proof Warranty - covers master cylinder and caliper
    Pre-bled with 100 cm hose for front use
    Uses DOT 5.1 fluid
    Fits 74 mm post mount brackets and adapters
    Works best with Hayes D series rotors
    Stock brake hose is 5.5 mm diameter
    For frames requiring a smaller diameter or longer hose we have the Jagwire brake hose (5 mm diameter, 3 metre length) & adapter option available
    One 3 m Jagwire brake hose & quick-fit adapter kit is enough for one bicycle (brakes front & rear)

    Use our Dominion Brake Builder to purchase your Hayes Dominion brake with rotors & adapters Learn More
  2. Hayes Dominion Bronze Brake Set Rear

    From: US$298.03

    To: US$372.78

    Hayes' award winning Dominion brake
    Available as A4 (4 piston) or A2 (2 piston)
    Bronze lever & caliper with black lever body
    Optional add-on here if you want Limited Edition Hayes Purple levers instead of the bronze levers
    Rear set with longer (180 cm) hose
    Piston caliper has cross-hair alignment
    Flippable lever with tooled reach adjustment
    Option of Standard (BFL) or Small Form Lever (SFL; designed for smaller hands)
    Small Form Levers are designed for anyone with smaller hands (not just junior riders) - Ellen at Shockcraft/Biken uses SFL on her Dominion brakes
    Dead stroke is factory set
    Lifetime Leak-Proof Warranty - covers master cylinder and caliper
    Pre-bled with 180 cm hose for rear use
    Uses DOT 5.1 fluid
    Fits 74 mm post mount brackets and adapters
    Works best with Hayes D series rotors
    Stock brake hose is 5.5 mm diameter
    For frames requiring a smaller diameter or longer hose we have the Jagwire brake hose (5 mm diameter, 3 metre length) & adapter option available
    One 3 m Jagwire brake hose & quick-fit adapter kit is enough for one bicycle (brakes front & rear)

    Use our Dominion Brake Builder to purchase your Hayes Dominion brake with rotors & adapters Learn More
  3. Allows fitment of Shimano Ispec II/EV shifters to Hayes brakes

    Hayes Part Code: 98-36137-K001

    Learn More
  4. Allows fitment of SRAM Matchmaker shifters to Hayes brakes

    Hayes Part Code:  98-36137-K002 Learn More
  5. Hayes Dominion Lever Assembly
    Includes master cylinder and lever blade
    Lever is SFL type (Small Form Lever) for smaller hands
    Small Form Levers are designed for anyone with smaller hands (not just junior riders) - Ellen at Shockcraft/Biken uses SFL on her Dominion brakes
    Same part for left and right
    Lever blade can be swapped to larger size
    Width of SFL blade is 11.5 mm (BFL blade is 15 mm wide)

    Hayes Part Number:  98-36118-K101 Learn More

Set Descending Direction

5 Item(s)