Practice question

Why is it dangerous to use compressed air to blow brake dust off drum brake assemblies?

  1. The air pressure will bend the brake backing plate.
  2. Brake dust may contain toxic asbestos fibers or fine particles that become airborne and can be inhaled.
  3. Compressed air will cause the hydraulic wheel cylinders to pop out.
  4. The cold temperature of compressed air will crack the hot brake drums.

Answer: B — Brake dust may contain toxic asbestos fibers or fine particles that become airborne and can be inhaled.

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