if your haro is stock, i strongly doubt it has any sealed bearings. i mean sealed cartridge bearings, not a little rubber dust cover.

poverty cranks are pretty lousy. any crank with an unsealed BB is bad news. fsa makes a few cranks, which ones are you looking at?

your brake cable should be as long as you need it to be. too short and it will get tangled up easily, too long and it will flop around. look through the bike pictures thread to see how long most people run their cables.