i may be wrong. i've replaced a lot of shifter bushings and filters on 201 and 124 cars. if there is a cable from the brake pedal to the trans, i don't remember seeing one or having an issue with any 722.3/4 trans interlock. 722.6 in the later bodies, 202, etc.-yes. i also don't see every mercedes on the road as i work on bmws, volvos and the occassional ferrari. someone who has done nothing but mb would be better. i've searched the wsm and can't find a reference to it. good luck, chuck.