I will share this with my fellow mechanics. (re:2005 ML 350)..........the squeak related to the pedal movement was from the spring under the hood that moves by the cable when you press the gas pedal. I took the ML to the dealer where they put some grease on the joint that the pedal moves under the dash. When I got home the squeak was still there. So with my son pressing the pedal I quickly found the spring was making the sound. As it expanded it scratched against the plastic hole the end was in. I just coated the spriing with heavy duty grease and the spring became quiet. So simple. Meanwhile the service rep. had told me this was very common problem and sometimes they have to replace the cable. It is just poorly designed...a rubber collar over the ends of the spring is all that it really needs.
rsl007