They're not in common, that's quake. They're there in system, they just don't load properly with some folks (myself included). Select a brush, hit S, then type in system/caulk in the texture field, hit enter, it should pop up.
For a good look at all the stuff in your system shaders if you can't get them to load properly, just open up your system.shader under base/shaders and look at the notepad file. It will list all system shaders, which you can access via a simple system/blahblahblah in the texture field as outlined above.