There's high risk involved in keeping passengers aboard during a brake fire. For one thing, passengers will not sit idle when they see smoke rising from underneath the fuselage, especially those who are seated directly below the source of the smoke. Additionally, when smoke is pumped into the cabin by A/C Packs, passengers who don't see the smoke will smell it and become desperate and claustrophopic if ordered to remain seated. Furthermore, the response time of fire trucks may be insuficient to check the propagation of flames and heat from reaching the center fuel tank. The risk of explosion is just too real to take the chance of keeping anxious, desperate, passengers in their seats.
Typical MTOW scenario.
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[ 28 October 2001: Message edited by: GlueBall ]