34 00 ... General Data: General:

Ensure cleanliness and only use rags which do not lose lint.
Wash away or vacuum up brake dust: do not clear it away using compressed air. This dust is a health hazard.
Ensure that no oils or grease enter the brake system: these substances would cause complete failure of the entire brake system.
When cleaning brake components with brake cleaning fluid (refer to BMW Parts Service), no brake cleaning fluid must enter the brake system.
Even the most minute traces of brake cleaning fluid must be avoided.