Any other activity in the brake work area can stir up the particles that have settled. Other Methods that Release Brake Dust into the Air. Also not recommended are cleaning with a dry brush or rag, wet brush or rag, garden hose, liquid squirt bottle, solvent spray, or ordinary shop-vac. These methods will also stir up visible and invisible brake dust. Many of these dust particles are so small that they can pass through the filter bag of a ordinary vacuum cleaner and spread throughout the garage.
Some boxes can even fit over a brake drum.
Good brake cleaning can be done without exposing technicians or contaminating a garage. A special air gun inside the box is used for cleaning. The manufacturer's instructions should be carefully followed when using this system and changing the filters or collection bags. Improper changing can release dangerous amounts of asbestos into the air. Check the hose is securely fastened to the HEPA vacuum container and to the brake enclosure.