Product description

KuKirin G2 Series & G4 Critical Notice

Upgrading these specific models requires strict attention to clearances to avoid crushing your new calipers:

G2 Pro (23 vs 24): Front caliper choice changes based on the production year.
G2 Pro (Clearance): You MUST install a 5mm front brake disc spacer.
G2 Max (Warning): Maintain a >2mm gap before tightening to avoid caliper damage.
G4 Caliper: DO NOT throw away the original factory metal washers.

Must Read: 5 Mistakes to Avoid (G2 Pro & G2 Max Upgrade Guide)

Send These Photos If Unsure

Not sure which version fits? Send us these three photos and our mechanics will confirm the correct setup.

KuKirin front wheel disc and caliper mount

1. Front wheel

Show disc side, fork structure and caliper mount.

KuKirin rear wheel disc and swingarm area

2. Rear wheel

Show rear disc side, swingarm area and caliper direction.

3. Brake connector

Show the power-off sensor connector shape and pins.

NUTT Dual Piston

Controlled braking for your KuKirin upgrade

NUTT system uses an open hydraulic design with dual-piston calipers, forged aluminum construction, and mineral brake fluid. Select the correct position and confirm fitment before installation.

Open system, dual piston
Forged aluminum caliper body
Internal or swivel hose routing
Heat-dissipating pad compatibility
Adjustable reverse-version caliper
Black forged aluminum lever

Product Specifications

Confirm the final configuration and SKU before purchasing.

Applicable Model	All KuKirin Electric Scooter Models
Brake Type	2-Piston Hydraulic Disc Brake Upgrade Kit (Front & Rear)
Brake Pad Options	Ceramic brake pads & Copper-based brake pads
Matching Rotor	140/160 × 1.8mm Brake Rotor, Uniform Clamping Force
Hose Spec	Front: 1350mm \| Rear: 2200mm (L1 Straight Leakproof Joint)
Pre-Filled System	Pre-bled brake lever for hassle-free installation
Safety Function	Integrated instant motor power-off sensor
Material Feature	Wear-resistant & rust-proof aluminum alloy
Mount Type	IS standard mount & Post mount options

What's Included

Package contents vary by selected position.

Position 01

Front Brake

Front dual-piston hydraulic caliper
Matching hydraulic brake lever
Front hydraulic hose (1350mm)
Pre-installed brake pads
Mounting hardware

Spacer is included only when selected.

Position 02

Rear Brake

Rear dual-piston hydraulic caliper
Matching hydraulic brake lever
Rear hydraulic hose (2200mm)
Pre-installed brake pads
Mounting hardware

Confirm swingarm clearance before ordering.

Recommended

Front & Rear Set

Front & Rear dual-piston calipers
Left & Right brake levers
Front (1350mm) & Rear (2200mm) hoses
Brake pads for both positions
Complete mounting hardware set

Best value for full braking system upgrade.

Fitment reminder: Adapter cables, rotor spacers, and washers may vary by KuKirin model and production year. Contact us if unsure.

Ordinary Brake

Standard cable-driven system

Braking Performance: Slow response, unstable stop
Sensor Feature: No power-off sensor, circuit risk
Sealing Structure: Poor sealing, easy oil leakage
Installation: Requires modification & adaptors
Piston Structure: Plastic 2-piston, easy deformation
Tube Length: Fixed tube length only
Warranty: 6 Months short warranty

NUTT Premium

NUTT Hydraulic Brake

Advanced 2-piston hydraulic system

Braking Performance: Sensitive & stable braking
Sensor Feature: Built-in power-off sensor protects motor
Sealing Structure: Leak-proof sealing, low maintenance
Installation: Direct bolt-on replacement
Piston Structure: 2-Piston CNC Aluminum Body
Tube Length: Custom 1350/2200mm lengths
Warranty: 1 Year warranty

Product description

KuKirin G2 Series & G4 Critical Notice

KuKirin G4

What to check before ordering

Send These Photos If Unsure

1. Front wheel

2. Rear wheel

3. Brake connector

Controlled braking for your KuKirin upgrade

Product Specifications

What's Included

Front Brake

Rear Brake

Front & Rear Set

Need help confirming your package?

Choose the Right Braking System

Ordinary Brake

NUTT Hydraulic Brake

Cart

Product description

! KuKirin G2 Series & G4 Critical Notice

KuKirin G4

What to check before ordering

Send These Photos If Unsure

1. Front wheel

2. Rear wheel

3. Brake connector

Controlled braking for your KuKirin upgrade

Product Specifications

What's Included

Front Brake

Rear Brake

Front & Rear Set

Need help confirming your package?

Ordinary Brake

NUTT Hydraulic Brake

KuKirin G2 Series & G4 Critical Notice