Index: django/db/models/base.py
===================================================================
--- django/db/models/base.py	(revision 3131)
+++ django/db/models/base.py	(working copy)
@@ -307,6 +307,11 @@
     def _get_FIELD_size(self, field):
         return os.path.getsize(self._get_FIELD_filename(field))
 
+    def _delete_FIELD_file(self, field):
+        filename = self._get_FIELD_filename(field)
+        if os.path.isfile(filename):
+            os.remove(filename)
+
     def _save_FIELD_file(self, field, filename, raw_contents):
         directory = field.get_directory_name()
         try: # Create the date-based directory if it doesn't exist.
Index: django/db/models/fields/__init__.py
===================================================================
--- django/db/models/fields/__init__.py	(revision 3131)
+++ django/db/models/fields/__init__.py	(working copy)
@@ -571,6 +571,7 @@
         setattr(cls, 'get_%s_filename' % self.name, curry(cls._get_FIELD_filename, field=self))
         setattr(cls, 'get_%s_url' % self.name, curry(cls._get_FIELD_url, field=self))
         setattr(cls, 'get_%s_size' % self.name, curry(cls._get_FIELD_size, field=self))
+        setattr(cls, 'delete_%s_file' % self.name, lambda instance: instance._delete_FIELD_file(self))
         setattr(cls, 'save_%s_file' % self.name, lambda instance, filename, raw_contents: instance._save_FIELD_file(self, filename, raw_contents))
         dispatcher.connect(self.delete_file, signal=signals.post_delete, sender=cls)