Note the information on the carbon ceramic brake

WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The following step(s) must be performed if the listed component(s) is/are installed.

Preparing work on the carbon ceramic brake

NOTE: TECHNICAL INFORMATION
Work on the carbon-ceramic brake disc may be performed exclusively by specially trained service personnel.
The service personnel must have received the proper training.

NOTE: TECHNICAL INFORMATION
Carbon-ceramic brake discs may not be modified/manipulated.
Retightening or disassembling brake components is not permitted.
Bore holes may not be mechanically processed. Counter-boring is not permitted.

When working on the brake system, proceed with particular caution and observe all notes.
The brake system is one of the most important safety systems on any vehicle.
Only remove and install wheels with the aid of the wheel jack.
This avoids damage to the carbon ceramic brake disc and brake caliper.
Ensure that the carbon ceramic brake disc is not subject to any impact stresses or collisions with hard materials.
This avoids damage to the ceramic surfaces and edges.

NOTE: TECHNICAL INFORMATION
For additional information see: REFERENCE SAMPLE CATALOG FOR ASSESSING VISUAL QUALITY OF CARBON CERAMIC BRAKE DISCS IN NEW CONDITION , or REFERENCE SAMPLE CATALOG FOR ASSESSING VISUAL QUALITY OF CARBON CERAMIC BRAKE DISCS IN USED CONDITION .
Ensure that the contact surfaces of the hub and the contact surfaces of the rim are not damaged.
Check

NOTE: TECHNICAL INFORMATION
For additional information see: ASSESSING THE CARBON-CERAMIC BRAKE DISKS (CSIC) FOR WEAR .
Check carbon ceramic brake disc for wear.

Courtesy of BMW OF NORTH AMERICA, INC.

Result

» Spalling on the edges of the friction ring of the carbon ceramic brake disc exceed permitted amount.

Brake discs which have been subjected to a high impact stress, such as from having fallen, must no longer be used. The brake disc is unusable due to visible and non-visible damage!

Measure
- See additional information: ASSESSING THE CARBON-CERAMIC BRAKE DISKS (CSIC) FOR WEAR .
Check

NOTE: TECHNICAL INFORMATION
Brake cleaner may not be used.
Check carbon ceramic brake discs for dirt.
Result

» The carbon ceramic brake disc is very dirty.

Measure
- See additional information: REFERENCE SAMPLE CATALOG FOR ASSESSING VISUAL QUALITY OF CARBON CERAMIC BRAKE DISCS IN NEW CONDITION , or REFERENCE SAMPLE CATALOG FOR ASSESSING VISUAL QUALITY OF CARBON CERAMIC BRAKE DISCS IN USED CONDITION .
Measure
- Only if required: While observing the Safety Instructions, clean carbon ceramic brake disc with a high pressure cleaner.
Measure
- For stubborn dirt in the bores: Carefully clean the bores manually with a suitable auxiliary tool (e.g. punch).