Inkesky StarUnion 4-Piston Hydraulic Disc Brake for eBike/Off-Road Bike

StarUnion, though not a widely recognized brand, collaborates with numerous prominent eBike/Off-Road Bike brands in the United States, such as Talaria, JuicedBikes, Super73Bikes, AventonBikes, and LectriBikes, providing OEM manufacturing.

The brake caliper is equipped with 4 pistons, ensuring powerful braking performance with every ride. Even during high-speed braking tests at speeds up to 47 mph, StarUnion brakes have demonstrated rapid stopping capabilities, as evidenced by multiple test videos on the product page.

The hose features jacketed Kevlar fibers for superior impact strength and heat management, preventing fluid expansion. Additionally, the brake is equipped with an exclusive patented olive for better sealing compared to other products on the market, and StarUnion will continue to supply these olive parts on Amazon.

Tailored for e-bikes, this brake features an automatic power-off sensor and is compatible with 2-pin connectors (NOT COMPATIBLE WITH 3-PIN Connectors). When braking, the power of the motor will be automatically cut off, ensuring smooth and effective braking. However, if your bicycle is not an e-bike or is equipped with a mid-drive motor, you may not need to use the power cut-off cable, as most mid-drive motors automatically cut off power when you stop pedaling.

StarUnion brakes undergo rigorous quality control, with 70,000 brake tests to ensure strict standards for your safety and riding pleasure on every journey. The brake hose length is 950mm (front)/1850mm (rear), and it comes pre-bled with mineral oil, a 200mm 2-pin male power cut-off sensor, high-performance ceramic brake pads (compatible with Shimano D02S/D03S), and a 5.0mm brake hose.

It is essential to double-check before purchasing to ensure compatibility with your e-bike's motor, as the brake comes with a 2-pin male connector for the power cutoff sensor. If your e-bike's motor requires a 3-pin connector, then this brake is not compatible. Please ensure that your motor has a 2-pin connector structure.

The packing list includes 2 levers, 2 calipers, 2 brake hoses, 2 brake pads, 2 power cut-off cables, and some spare olives and brass connectors. Adapters and rotors are not included.

During installation, it is crucial to avoid squeezing the brake lever after the spacer is removed and before the wheel is installed, as this will cause the brake pads to close, requiring them to be pushed outwards.

product information: