'76 brake help

[frsyth72]

The other day I was pulling into the parking space at and the brake pedal when straight to the floor I was in luck though and there was this acura that was able to stop me, no damage to my truck but took out the whole finder of the car. Anyways after I got stopped I noticed a Puddle of brake fluid under the truck by the front passanger tire, but couldn't find a leak any where. When we got the truck home I started bleeding the brakes,(still couldn't find any leaks). Now I know when you are bleeding brakes you start furtherst from the master cylander, but it looked like the fliud came from the front so I wanted to check there, but they both had really good pressure. then to the back, nothing, the driver side would give about one drop of fluid out the even less out of the passanger. I pulled the drum off the passanger side and the whole brake was soaked on the inside by this goo that looked like brake fluid, grease and gear oil. I was thinking that the wheel cylander just went out, dose any one recommend checking/changing anything else out when I got to replace the cylander?? Plus it is fun because I just had surgury on my shoulder so I am trying to do it all one handed, at lease the wife will help me move the 33"s off :p thank you for any advise one what else I should check.