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April 1, 2021 Service bulletin

Diagnosis of Compound Brake System Complaints in M Vehicles: 1. Visible cracks are caused by high thermal...

BMW technical service bulletin B360121 for 2015-2017, 2019-2021 BMW X5, 2018-2021 BMW X3 and 2019-2021 BMW Z4 and others.

Bulletin number
B360121
Component
Equipment adaptive/mobility
Summary
Diagnosis of Compound Brake System Complaints in M Vehicles: 1. Visible cracks are caused by high thermal stresses during rapid heating and cooling of the brake discs. Braking from high speed with cold brake components (less than 212 degrees F) increases the likelihood of cracks to form.

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