Hayes Dominion A4 Disc Brake Lever

Yes, this lever is designed to work seamlessly with both the Dominion A2 and A4 hydraulic disc brake kits.

This component is typically sold as a replacement lever body. You should expect to perform a full brake bleed after installation to ensure the system is free of air and operating at peak performance.

No, this specific lever is configured for the left side, which corresponds to the front brake setup on most mountain bikes.

The Dominion A4 is known for its precise modulation, which gives you a more nuanced feel at the lever. This allows for better control when scrubbing speed on technical terrain compared to levers with a more binary, on-off feel.

If your current hose is in good condition and the correct length, you can often reuse it. However, we recommend using new olives and barbs whenever you disconnect and reconnect a hydraulic line to ensure a leak-free seal.