Four Piston Hydraulic Disc Brake Set For Mountain Bikes With Aluminum Lever And Caliper Pre Bled For E-Bike And Fat Bike Left Front 850mm Right Rear 1550mm Lines Quiet Braking Upgrade

Four-Piston Hydraulic Disc Brake Upgrade for MTBs & E-Bikes
✔️ Front 850mm and rear 1550mm hydraulic lines, pre-bled

This four-piston hydraulic disc brake kit delivers strong, reliable stopping power for mountain bikes, e-bikes, fat bikes, and scooters. Pre-bled and ready to install with mineral oil, it’s built for easy upgrading from mechanical brakes.

✅ 4-piston hydraulic calipers deliver high braking force
✅ Pre-bled with mineral oil for quick install
✅ Integrated hydraulic cylinder minimizes oil leaks
✅ Quiet resin-metal brake pads protect rotors
✅ Front 850mm, rear 1550mm lines fit common MTB layouts
✅ Compatible with MTB, e-bike, fat bike, scooter and more

💡 How to choose and install a hydraulic brake kit for mountain bikes and what should you check before buying?

Installing a hydraulic brake kit is handy when you follow these steps:

- Check compatibility with frame, rotor size and lever reach - Confirm line lengths (front 850mm, rear 1550mm) fit your bike layout - Bleed with mineral oil and avoid air in the lines - Test lever feel and stopping power in a safe area