Join Date: Feb 2005
Location: LIncolnshire, , United Kingdom
Model: 1993 GL1500SE(P)
I think you are right with your assumption that it is a frozen caliper . The GL1500 has 2 front rotors (brake Disks) , on operated by the front brake and one by the rear brake pedal (dual braking). It is fairly common for the caliper to become "frozen" and cause a scraping sound as one (or more) brake pads are constantly in contact with the rotor. Take off both rotor covers and check that the calipers are able to slide feely. They should move in and out towards the rotor, only slightly but it should be noticable. If they don't, remove them and re-grease them (some use copper grease but I use silicon grease as I find it lasts longer) before reasssembling.
If not the calipers it could be that you have picked up a stone or similar bebris which is trapped but this is unusual .
Also check that your pads are not too worn by the constant rubbing on the rotor.
1993 GL1500SE 114,000 and Rising
North East Lincolnshire, UK