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82 240d intake manifold help

when I pulled the air cleaner to remove linkage for a valve adjustment, I noticed a butterfly flap inside the intake manifold that can be adjusted to open or close. mine stay mostly closed until the thottle was down about 3/4 of the way and then just opened 1/4 of they way at full throttle. when and how far should this open for the best perfomance. my car is really slow but I've been getting it better with lots of tuning but still needs all the help I can get.

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1981 300CD Brake Dragging still w/ new caliper

Aloha guys,

Back brake started dragging intermitantly for about a month, replaced both back calipers. Now it's worse! I can't even make it a mile before it's egg fry hot. Had to pry the caliper off, could not get the piston to return until I pulled the brake line off, then it went in smoothly.
Is there a valve or obstruciton preventing fluid return? It's only the back passenger side. I'm ready to disable the back brakes if I can't figure this out!

Thanks
Chris

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