I just took it grocery shopping. Nothing too unusual. What was unusual was what happened on the way home. As I was going down the highway, I felt a quick shake from the truck and felt it in the steering wheel. It felt like I ran over something, but I couldn't see anything in the mirrors. I pulled over on the shoulder and looked all around the truck, but I couldn't see anything. I wanted to get off of the busy highway so I drove about 25-30 for the 100 yards to where a dirt road met the highway. I looked all around the truck again. I even checked the driveshaft for play. It's more than it should have, but what it's always had so that wasn't it. I gave up and decided to drive home slowly on the dirt roads. I turned around and drove back to the stop sign and thought that I heard a noise when I pushed the brake pedal so I backed a slight hill to roll down. As I was backing up, I heard and felt a loud "bang" that sounded like I had backed into something, but nothing was there. About 1/4 mile farther, a dirt road went the other direction from the highway toward home so I limped along the shoulder to that road. After turning off of the highway again, I shut off the engine and hit the brakes a few times. I could hear a grinding noise for sure and I thought it was on the driver's side. I crawled underneath the truck and found that all of the hardware that holds the caliper on was missing on the driver's side! I put on my MacGyver hat and decided to pull the caliper off and drive home. After I got the tire off, I took a socket out of the set that I carry to change tires and drove it between the pads to keep them from expanding. Then I took a small can of WD-40 and taped it to the caliper to hold the socket in. Then I took a couple of old, nasty ratchet straps that I had along and tied the caliper to the back of the leaf spring. I put the tire back on and drove home taking it easy on the brakes.