What happens when a radiator cap goes bad?

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I was riding my bike, and I parked it and walked away for a while, and noticed that there was radiator fluid on the ground inline with my radiator/radiator cap. It's full fairing so i don't really know where it leaks out of. The bike had been highway for 15 minutes. When i got the bike, and checked the fluid, there was practically none in it. Does this sound like a radiator cap, radiator, or head gasket?
 
Caps fail 2 ways.

1. They quit sealing which won't allow pressure to build up. Water will be pushed out the overflow tube.

2.(Most common failure) The rubber expands so that it totally seals the radiator into a shut system. When this happens pressure can't be released. Plastic radiator tanks crack, solder joints pull apart. heater valves leak and hoses can blow.
 
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