German Made Trickstuff Direttissima 4-piston Mountain Bike Brakes [In for Test] - Singletracks Mountain Bike News
Brembo GT Brake System - 4-Piston | 326x30 mm (12.8') | 1-Piece Disc - – Mann Engineering
Amazon.com : JFOYH 4-Piston Pre-Bled Hydraulic Disc Brake Set for Mountain Bike, Bike Disc Brake Kit with 160mm Rotors, Front and Rear Levers(PM Adapter Included) - Left-Front&Right-Rear : Sports & Outdoors