Name: NUTT Hydraulic Disc Brake Upgrade Kit for KuKirin Electric Scooters
Brand: NUTT
SKU: 2NF1B+2NR2B+G4kitS2
Price: 59.99 EUR
Availability: InStock

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

01

Confirm the correct configuration

Check the scooter model, production version, front or rear position, rotor side, mounting type and brake connector. Confirm whether a spacer, adapter cable or original washer is required.

02

Inspect the package before fitting

Make sure the caliper, lever, hose, brake pads and selected hardware match the purchased configuration. Do not install damaged parts or discard model-specific hardware before fitment is confirmed.

03

Remove the original brake safely

Secure the scooter before removing the original brake. Protect the rotor and hose area from contamination, and keep any original washers or model-specific parts for comparison.

04

Install the lever and caliper

Mount the lever and caliper using the correct hardware for the selected configuration. Keep the caliper aligned with the rotor and do not force parts into position.

05

Route the hose and check clearance

Route the hose away from sharp edges, moving parts and folding points. Check the gap around the caliper, rotor, fork, swingarm, tyre and other components before final tightening.

06

Test before normal riding

Check lever operation, rotor rubbing, bolt security and motor power cutoff. Complete a controlled low-speed test in a safe area before normal riding.

G2 Pro

Front-caliper choice may vary by production year. Some configurations require a 5 mm front brake-disc spacer. Confirm the model year and clearance first.

G2 Max

Check the caliper clearance before tightening. The applicable fitment information requires a gap greater than 2 mm for the relevant configuration.

G4

Keep the original factory metal washers and confirm the rotor side, caliper direction, connector and hose routing before riding.

How do I confirm whether this brake kit fits my KuKirin scooter?

Confirm the scooter model, production version, brake position, rotor side, mounting interface and brake-connector configuration before ordering. If you are unsure, send clear photos of the front wheel, rear wheel and brake-lever connector to nuttbraking@outlook.com.

Is the kit available for the front brake, rear brake or both?

The available configuration may be Front brake, Rear brake or Front & Rear Set. Select the position that matches your scooter and check the package contents for the selected variant before ordering.

What should G2 Pro owners check before ordering?

For the KuKirin G2 Pro, the correct front-caliper choice may differ between production years. Some configurations also require a 5 mm front brake-disc spacer. Confirm the model year, rotor position and available clearance before installation.

What is the main clearance warning for the G2 Max?

For the KuKirin G2 Max, check the clearance between the caliper, rotor, fork, swingarm and other moving parts before tightening the bolts. The supplied fitment information requires maintaining a gap greater than 2 mm for the applicable configuration. Do not assume that every G2 Max version uses the same setup.

What should I remember when installing the brake on a G4?

For the KuKirin G4, keep the original factory metal washers until installation and fitment checks are complete. Also confirm the rotor side, caliper direction, brake connector and hose routing before riding.

What hose lengths are available?

The listed hose options are 1350 mm for the front and 2200 mm for the rear for the applicable configurations. Confirm the required length according to your scooter, brake position and routing path.

Does the hydraulic brake include a motor power-off sensor?

The listed NUTT configuration includes an integrated motor power-off sensor. Connector types and adapter-cable requirements may vary by scooter model and production version, so match the connector before ordering and test the cutoff function after installation.

Is the hydraulic brake pre-bled?

The listed configuration uses a pre-bled brake lever system for easier installation. You must still check rotor alignment, caliper clearance, hose routing, connector compatibility and lever operation before riding.

What should I check after installation?

Check that the caliper is aligned with the rotor, the rotor does not rub, all bolts are correctly tightened, the hose is not pinched, and the brake lever operates normally. Test the motor power cutoff and complete a low-speed test in a safe area before normal riding.

Still unsure about fitment? Send your front-wheel photo, rear-wheel photo and brake-lever connector photo to nuttbraking@outlook.com before ordering.

View More Guides

NUTT Hydraulic Disc Brake Upgrade Kit for KuKirin Electric Scooters

Product description

KuKirin G2 Series & G4 Critical Notice