Depending on the model and year you may have a rear drum or a rear disc. Check out the articles below!
All of the CX500 (except the CX500EC Sports) and GL500 variants came with a drum brake at the rear. The CX650ED Eurosport and both Turbo variants had a disc at the rear, where the CX650 Custom and GL650/700 variants used a drum.
Servicing the rear drum brake: