Peter:
Thanks for the reply. I consider myself a pretty accomplished mechanic after home wrenching for 40 years. I do mainly British, but have a '63 300SL and an '85 500SL in the Mercedes side of the shed. I immediately concur with your evaluation, but have been on the problem for a week. There is no fluid loss. Due to the dual nature of the hydraulic system,if there were an open line, I would expect a failure in either the front or rear system. I get no movement in either the front or rear pad/shoes. There are no fluid losses in the reservoir. There are no puddles. I am in pain.
Regards
BB