4 Piston Hydraulic Disk Brake Upgrade, $100 plus parts, order them from Amazon, when you get them book an appointment online and bring them over with your bike for installation.
Make sure you order the right 2 or 3 wire connectors.https://www.amazon.com/dp/B0FJ1VPM2P?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1
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