The brakes tend to be a problem on the 4th-6th generation accords
. IMO I would use better pads and possible do a legeng caliper/rotor upgrade. Also upgrading the rear brakes (if they are drum) to disc will help out the front brakes.
I would check the rear brakes because if they start to go bad you won't really notice since the front brakes take most of the load duing braking. The braking system is just that; a system. You must maintain it and make sure all components are working properly to get the most longevity out of it.
I think the average lifespan for brakes is around 2-3 years 30-45K
As far as the humming in the left front it sounds like it would be the wheel bearing. But make sure tires have been rotated balanced, properly filled etc.