Unlikely they had a hot brake problem at a major airport like LAS. They probably extended the gear to help burn fuel off as I did once at TGU to land south at proper weight. Hot brakes were our concern at Fresno with shorter runways and 10 minute turns. If they lost the yellow and green hydraulic systems they would have landed hot with no flaps, only slats with the blue system seeing the chart.
No reverse and accumulator brakes so one application. No yaw dampers but at that low of an altitude who cares? What was with all the yawing? Was something else out too? Did the pilots do it? The throwing up of many passengers makes me think there was another problem. Rudder control was not proper, why? Surging engines could do this with no yaw damper.
We are waiting for more info.