Package contents may vary depending on the selected option, such as front brake, rear brake, or front and rear set.
Show disc side, fork structure and caliper mount.
Show rear disc side, swingarm area and caliper direction.
Show the power‑off sensor connector.
Designed for heavier electric scooters and e-bikes, NUTT A4-D provides powerful stopping force, excellent stability and enhanced riding safety.
Designed for powerful electric scooters and high-performance e-bikes, the NUTT A4-D combines four-piston hydraulic power with intelligent safety technology for confident braking under heavy loads.
Four hydraulic pistons generate stronger and more balanced braking force for heavier electric vehicles.
The built-in sensor automatically cuts motor power when braking, improving rider safety and control.
Optimized hydraulic transmission maintains stable braking performance during high-speed and heavy-load riding.
| Parameter | NUTT Hydraulic Brake | Ordinary Brake |
|---|---|---|
| Piston | 4 Piston Aluminum | 2 Piston Plastic |
| Tube Length | Custom 1350/2200mm | Fixed Only |
| Material | CNC Forged Alloy | Cast Iron |
| Warranty | 1 Years | 6 Months |
| Bleed System | Quick Oil Bleed | Complicated Maintenance |
Why 80% of riders regret sticking with cable brakes — and how NUTT hydraulic changes everything.
Quick answers to the most common questions about NUTT hydraulic brake systems.
The NUTT A4-D is built to last. It features a fully sealed circuit and a sweat-proof coating that resists rain and mud ingress. This ensures reliable braking performance and protects the internal components from corrosion, even when you ride in less-than-ideal conditions.
Auto pad compensation is a maintenance-reducing feature. As your brake pads wear down over time, the system automatically adjusts the pistons to keep the pads at the optimal distance from the rotor. This means you get consistent lever feel and braking power without needing to manually adjust them frequently.
A 4-piston brake, like the A4-D, delivers significantly stronger and more consistent clamping force. This translates to more responsive stopping power, which is especially beneficial for heavier electric scooters, e-bikes, or for riders who frequently tackle steep hills and need extra confidence in their brakes.
The A4-D is natively designed for 160mm rotors, but it offers great flexibility. With the correct adapters (not included), it can also be mounted with 140mm, 180mm, or even 203mm rotors, making it a very versatile upgrade for various setups.
Absolutely. While the standard power-off wire is 30cm, we offer customization for bulk orders. You can specify your required power-off wire length, just as you can with the hydraulic hoses, to ensure a perfect and clean installation on your bike or scooter.
