Race-Driven MudRat Brake Rotors You will receive 2 brake rotors to replace the rear brakes on the following: 2016 2017 2018 2019 2020 2021 2022 2023 Can-Am Defender HD10 This new rotor design has been tested over numerous years in an effort to extend the life of brake pads in excessive mud and other abrasive conditions. The MudRat Rotor is a solid rotor design which keeps mud and other abrasive materials from filling in the vent holes and prematurely wearing your brake pads. These rotors are designed to be used in 90% mud grade or higher.