HayesDominion T4
Not sold as a complete brake on Hayes' EU store; US store lists US$349.99 per brake
- Pistons
- 4 x 17 mm
- Rotor sizes
- 160 / 180 / 203 mm (D-Series)
- Fluid
- DOT 5.1
- Lever
- Carbon fibre, tooled reach & pad-contact adjust
- Weight
- 257 g
- Weight
- 257 gper brake with 90 cm hose and mount hardware, claimed
Overview
Hayes' limited-edition, lightest four-piston Dominion with a carbon lever and titanium hardware: 4 x 17 mm pistons, 257 g claimed; US$349.99 per brake on Hayes' US store.
The limited-edition Dominion T4 puts the power, sensitivity and reliability of the Dominion family into Hayes' lightest four-piston chassis. It adds a Reynolds-designed, in-house-produced carbon-fibre lever, titanium hardware, a composite reservoir cover, aluminium-backed pads and weight-reducing machining, for a claimed 257 g with 90 cm hose and mount hardware.
Hydraulics follow the Dominion recipe: DOT 5.1 fluid, low-expansion Kevlar-weave hose, Two-Stroke bleed and four 17 mm caliper pistons with KingPin pad retention and bottom-load pads. The T4 adds tooled pad-contact adjust, tooled reach adjust, an adjustable banjo and axial lever orientation, and is designed around D-Series rotors in 160, 180 and 203 mm.
- Lightest Dominion four-piston: 257 g claimed
- Reynolds carbon lever, titanium hardware, composite reservoir cover
- Four 17 mm pistons, KingPin pad retention
- Tooled reach and pad-contact adjust
- Sealed cartridge-bearing lever pivot
Gallery
Full specifications
Caliper
- Caliper piston size
- 17 mm
- Pad material
- T106 semi-metallic, T100 sintered metallic
- Pad retention
- KingPin
- Pad insertion
- Bottom load
- Crosshair alignment
- Yes
Lever
- Reach adjust
- Tooled
- Pad contact adjust
- Tooled
- Lever orientation
- Axial; flip-flop lever
- Lever pivot
- Sealed cartridge bearings
- 2-piece clamp
- Yes
- Materials
- Carbon-fibre lever, composite reservoir cover, titanium hardware
Hydraulics
- Hose
- Low expansion with Kevlar weave (K2 hose)
- Fluid
- Hayes DOT 5.1
- Bleed
- Two Stroke
- Adjustable banjo connection
- Yes
General
- Weight
- 257 g (90 cm hose & mount hardware)
- Compatible rotor (not included)
- D-Series (160, 180, 203) w/ QuickBite² and MRC
- US price
- US$349.99 per brake
Manufacturer specification — Hayes. Specs and prices can change; check with the brand or your dealer.
Hayes Dominion versions compared
| Dominion A4 | Dominion T4 | Dominion A2 | Dominion T2 | |
|---|---|---|---|---|
| Price | €278 | — | €139 | — |
| Pistons | 4 x 17 mm | 4 x 17 mm | 2 x 24 mm | 2 x 24 mm |
| Fluid | DOT 5.1 | DOT 5.1 | DOT 5.1 | DOT 5.1 |
| Hose | Kevlar, 180 cm | — | Kevlar, 100 cm front / 180 cm rear | K2, 100 cm front / 180 cm rear |
| Bleed | Two-Stroke dual port | — | — | — |
| Lever | Tool-free reach adjust; SRL short-reach option | Carbon fibre, tooled reach & pad-contact adjust | Tool-free reach adjust; SRL option | Carbon fibre, tooled reach & pad-contact adjust |
| Weight | 310 g | 257 g | 303 g | 254 g |
| Rotor sizes | — | 160 / 180 / 203 mm (D-Series) | — | — |
| Weight | 310 g | 257 g | 303 g | 254 g |
| E-bike rated | Yes | — | — | — |
eMTBs that come with the Hayes Dominion
Hayes Dominion T4: FAQ
How much does the Hayes Dominion T4 weigh?
Hayes quotes 257 g (per brake with 90 cm hose and mount hardware, claimed).
Is the Hayes Dominion T4 suitable for e-bikes?
Hayes does not specifically rate it for e-bikes. Check the manufacturer’s approval and your bike maker’s recommendations before fitting it to an eMTB.
What are the key specs of the Hayes Dominion T4?
Pistons: 4 x 17 mm; Rotor sizes: 160 / 180 / 203 mm (D-Series); Fluid: DOT 5.1; Lever: Carbon fibre, tooled reach & pad-contact adjust; Weight: 257 g.
What other versions of the Hayes Dominion are there?
Dominion A4 (€278), Dominion A2 (€139), Dominion T2.
