yesterday on my way to school to take a final the oddest thing happened i would tap the break and my brakes would lock up. i quickly turned for home. when i got there i pulled all the weels off to inspect the brakes. of coarse the problem was with the last one i pulled. any way there was this black hichly frictionable substance in the rear drum. im 99% sure its the rear axle seal leaking, but i thought that oil was a lubricant, i guess under brake heat it breaks down and becomes super frictionable. i was driving in the mud the 2days before, but it wasnt deep and i really dont think thats it. anyway i pulled the drum again after about 100 miles and it looked fine. any therois would be appreciated.