Hayes Dominion A4 T4 Hydraulic Mountain Bike brakes brakeset - $185 (South Mountain)

Hayes Dominion A4 T4 Hydraulic Mountain Bike brakes brakeset 1 thumbnail

part type: brakes

condition: new

make / manufacturer: Hayes

model name / number: Dominion A4

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I tested a set of these brakes on a DH bike for a week at Angel Fire, about 100 miles or so, A4 on the front and A2 on the back. They came through in every way. I am 200lbs and they handled double black trails at Angelfire without sweating. I never felt unsafe on them. These are true DH capable brakes with modulation that leaves them very useable on any trail bike also. You will never feel like they are too powerful or touchy, while being able to lock each tire with one finger if you want to. The modulation is naturally better than the shimano standard binary feel, but don't feel anywhere near as lazy as many other so-called modulating brakes. I did sample different pads. I settled on the MTX Gold Ceramic on the front and the stock metal pad on the back. The MTX pads are a nice, noise-free $40 upgrade that come with the used brakes. Being able to lock up the rear is something I don't want that to happen without a deliberate effort, and these provide that modulation. Switchbacks were a breeze with them.

If you have never had a truly powerful brake that actually modulates, they will surprise you. I have used Hope Tech 3 V4's and Quadiems on the same terrain and these are about 30-40% more powerful than each of them. They deliver more brake control than shimano, no surprise there. No wandering bite point, or fade. After bedding in, they remained noise free, even in 1/2" of rain.

Brand new A4 set, for $185 ea side. MSRP $550
Brand new T4 set with carbon fiber lever, for $205 ea side. MSRP $690

I-10 and Chandler Blvd

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post id: 7875548100

posted: 2025-08-21 15:14

updated: 2026-01-31 06:05

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Hayes Dominion A4 T4 Hydraulic Mountain Bike brakes brakeset -...

I tested a set of these brakes on a DH bike for a week at Angel Fire, about 100 miles or so, A4 on the front and A2 on the back. They came through in every way. I am 200lbs and they handled double...