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Discussion Starter · #1 ·
Hayes have released at Sea-Otter three new variants of their award winning Dominion A4 disc brake:

Hayes Dominion A2 is a 2 piston version of the same brake: https://hayesdiscbrake.com/product/dominion-a2?cat_id=33
Goggles Beige Silver Strap Steel


J-UNIT versions have been released of the Dominion A4 and A2. These have a new lever designed for smaller hands:
Black Tan Beige Tool Metalworking hand tool

The giveaway is the bigger span between the pivot and the grip on the blade. Compare to the adult version below:
Metalworking hand tool Metal Tool Hand tool Iron


Same pricing, same adapters, same rotors as the existing A4 series but the D series rotor now has a smaller 160mm option.
 

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Discussion Starter · #3 ·
so the A2 uses the same pads as the A4?
Different pads but same compounds, I haven't seen them yet but I expect they'll be smaller. A4 brake is deceptively large.

A2 P/N's are 98-36141-K102 for semi metallic. K101 for sintered metallic.
 
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