for a brake fire, yes, powder is good, but you must be prepared to back it up with foam/water spray, should it escalate. powder is only effective whilst in use, has no burnback resistance nor cooling qualities. with tyres involved, only water/foam spray is going to be effective, with powder or halon available should hydraulic lines fail, releasing free flowing flammable liqiuds to create a "three dimensional" or "running fuel" fire. glad the fire fighters remembered their correct positioning.
