Jimm 12/16/2012The source is most likely leaking brake fluid; from the brake calipers or flexible brake hoses. Try the many on-line auto parts sources; such as - www.autopartswarehouse.com, www.partsgeek.com or www.rockauto.com for the replacement parts.
cmd01758 12/21/2012If you dont have any brakes then yeah, you blew a brake line, but, if the brakes are working fine then you need an axle seal. Ill bet if you check the differential fluid your going to find that its either very low or theres nothing there depending on how long you have had this problem. Im assuming this is only happening on one tire.