My "guess" is that the emergency brake would not have caused that symptom. the emergency brake is not going to survive 3000 rpm straight gear. Sounds like the calipers have seized. After the flat tow home the brake fluid would have had enough time to stop boiling and return to normal temp. If there are still stuck thats beyond my experience.

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77' 300D, "Cartman" SOLD @ 150K (didn't know what I had)
83' 300SD, "The Superdon" 325k+ @ 28mpg
95 E320 wagon, "Millennium Falcon" 231k+ @ 24 Mpg
95 E300D, "Sherley" 308k @ 33.69 Mpg, currently anticipating a head
99 Suzuki Intruder "Trudy" @ 45 mpg