Juin GTF-4 Hybrid Hydraulic Disc Brake Caliper

The Juin GTF-4 Hybrid Hydraulic Disc Brake Caliper is a high-performance braking component designed for bicycles. Hybrid Hydraulic System: This system combines the reliability and power of hydraulic brakes with the simplicity and ease of maintenance of mechanical disc brakes. The hybrid design allows for precise control and efficient braking in various conditions. CNC Forged Aluminum: The caliper is typically made from high quality aluminum. 4-Piston Design: The GTF-4 feature a 4-piston setup, which provides more even and powerful braking force distribution across the brake pads. Easy Installation and Maintenance: The design of the caliper often emphasizes ease of installation and maintenance, making it accessible for both professional mechanics and DIY enthusiasts. All-Weather Performance: The hydraulic system in the caliper ensures consistent braking performance in various weather conditions, including wet and muddy environments. Aesthetic Design: Along with functionality, the caliper may feature a sleek, modern design that enhances the overall aesthetic of the bicycle. JUIN TECH Hybrid 4-piston double-sided action hydraulic disc brake R&D, Manufacturing, Production in Taiwan Forged aluminum caliper+ CNC Precision oil channel manufacturing process The one-piece piston is made of 7 series aluminum with wear-resistant lubricating coating. Polished bright surface, matte back, anodized anti-oxidation finished. Flat mount system. High-stability and non-corrosive mineral oil. The closed system oil channel is simple and easy to clean and maintain. JUIN manual operation adjustment knob to adjust the clearance between pistons. Compatible with drop bars of road bike, and C caliper (SHORT PULL) brake levers. The most lightweight model among the GT series of JUIN hybrid hydraulic disc brake system.

• DESIGNED & PRECISION-MADE IN TAIWAN — A DIFFERENT CLASS — JuinTECH designs and machines the GTF-4 in-house in Taiwan, not a cheap, mass-produced caliper. The body is die-forged from European high-purity 6061 aluminum, then the piston bores are CNC-machined — forged for strength, machined for precision. Just 136g per caliper.
• TRUE HYDRAULIC POWER — OPPOSED 4-PISTON CONTROL — GTF-4 turns your cable input into full hydraulic braking inside a sealed caliper: four opposed pistons press the pads evenly for immense yet linear, controllable modulation. A compact Flat Mount design that fits modern road, gravel and new-generation folding frames. Cable-actuated for standard mechanical short-pull / drop-bar road levers.
• OPPOSED 4-PISTON — LINEAR, CONTROLLABLE POWER — Four pistons spread clamping force evenly for a fully pressed pad, even wear and braking that grows linearly with your finger — modulation, not just stopping. Not a stripped-down GTF-6: fewer pistons buy a lighter body, wider frame compatibility and more intuitive fitting.
• FULL-METAL 7075 PISTONS, TOOL-FREE ADJUST, FLAT MOUNT — Four pistons in 7-series aerospace-grade 7075 aluminum route heat off the pads into the die-forged body for fade resistance; pair with JuinTECH RADIAL rotors to shed it. A tool-free knob restores pad-wear clearance by hand, roadside. Sealed hydrophobic mineral oil stays consistent in rain or mud. Flat Mount — rear takes a 160mm rotor with no adapter.
• DP43 + SP43 PADS — FRONT & REAR SET, GET THE CABLES RIGHT — Sold as a full-bike pair of 2 calipers (rotors not included) for Flat Mount frames. Uses DP43 + SP43 pads (shared with GTP-4 and ETF). Fits short-pull / caliper-brake (drop-bar) road levers. Run compressionless housing + a low-friction inner cable for full performance — even more so on folding bikes with tighter routing. Zero-paint anodized finish. UNLEASH! NEXT LEVEL.