About this part
What it does. Wagner Brake Front Disc Brake Rotor Wagner Brake 621-BD180578E is the disc the brake pads clamp onto to convert motion into heat and stop the wheel.
Symptoms that point to this part
- Pulsing brake pedal or steering wheel shudder
- Deep scoring or a lip on the disc face
- Blue heat spotting
Service note. Rotors are replaced in pairs per axle, together with fresh pads.
Fitment. Catalogued as fitting 2021 BMW M240i Xdrive, 2019–2020 BMW M240i, 2019 BMW 440i Xdrive Gran Coupe, 2019 BMW 440i. Engine, sub-model and trim can narrow fitment further, so check those attributes on the listing before ordering.