Check those rubber brake hoses too. They can expand when you hit the brakes and then, when you let up on brake pedal, try to contract causing continued drag.

One of those great pieces of info I picked up off this site.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)