Mercedes Parking Brake Fix W212 W211 W210 (not staying down)

Simple fix to the common parking brake issue on Mercedes cars. This was performed on a left-hand drive (U.S.) E350 (W212 platform) but the issue is common on many late models such as the C and M series. No need to replace the parking brake assembly which will cost you hundreds of dollars. Mercedes C Class E Class and all other Mercedes that have a mechanical parking brake and inaccessible panel where you can see the spring and cable.