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June 4, 2021 Service bulletin

Grinding noise from the rear brakes when braking

Mazda technical service bulletin 04-002-21-3809 for 2016-2020 Mazda CX-5, 2016-2020 Mazda MAZDA6 and 2016-2020 Mazda CX-9 and others.

Bulletin number
04-002-21-3809
Component
Service brakes
Summary
Some vehicles equipped with electric parking brake (EPB) may exhibit a grinding noise from the rear brakes when braking. This may be caused by the rear brake pads not having the capability to remove the rust from the rear brake discs. The red rust accumulated on the discs is exposed to high temperatures during braking, and consequently the rust turns black. As the black rust is too hard to be removed by the brake pads, the rust progress is accelerated, resulting in the grinding noise.

Owners of these vehicles have filed 190 complaints in the brakes category.

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