I am considering buying the bad boy lightning z with either the 31hp air cooled kaw or the 26hp liquid cooled. Either that or the pup with the 30hp kohler. My question is for anyone who has operated or operates a bad boy mower. What brakes on them? Do their non greasable spindles last? Also, can the bearings be replaced on the spindle without junking the whole thing? Any input would be greatly appreciated. Thanks.