Disc brakes with Vortex lubrication. This cap-style rotor disc brake fits over a Vortex hub, and disc brake actuator features a cast ball clamp. Drop N Go auto coupler latch features oversized master cylinder with solenoid installed. Kit includes a pair of GalvX-coated cap-style disc brakes, Vortex hubs, disc brake actuator, brake line kit, brake hoses, brass fittings, and attachment hardware. Fits 13", 14", and 15" wheels. DOT 3 brake fluid not included.