Help!! the parking brake has failed on my 96 E220 COUPE. Fault shows as loose release lever on lower driver-side dash. The foot pedal appears to operate the parking brakes when depressed but fails to engage the ratchet. From this I deduce that perhaps the parking brake release cable mechanism/ ratchet under the dash has failed rather than the operating cables further back. How easy is this cable assembly to inspect/replace. Any suggestions/tips as to what component is likely to have failed and how repair/ access this welcome. thanks