Mugen Seiki MRX4 Brake Rotor Upgrade MRX4-21/GO by 3Racing  [MRX4-21/GO]

Brake Rotor for MRX4 Chassis

This brake disc serves as an RC-scale replacement for Mugen Seiki MRX4 and MRX4-R cars and is catalogued under part number MRX4-21/GO. It provides a direct-fit option to repair or modify rear brake assemblies on 1/10 on-road vehicles using the MRX4 mounting pattern.

Installation notes: inspect rotor to hub alignment and tighten fasteners to your vehicle's recommended torque, replacing any worn hardware. Install one side, check for lateral runout, then fit the opposite disc and ensure free wheel rotation before reconnecting the drivetrain. Standard MRX4 toolset is adequate.

Tuning role: swapping discs changes braking feel and modulation at the wheel, informing adjustments to brake bias and diff settings. Use matched discs and test in short increments to assess stopping balance and corner entry behaviour.