34 00 ... General Information: General:

WARNING: This page is about a different car, the 2007 BMW 550i, 2006 BMW 550i, 2005 BMW 545i, and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.

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 cleaner, do not allow brake cleaner to get into the brake system.
Even the most minute traces of brake cleaner must be avoided.