I am not sure that the e-brake is not to blame. I'll have a look at the system this weekend (but I am not sure how to positively diagnose that it was the brake at fault here).

Agreed - if that is not the case, I am beginning to think that perhaps the MC is a suspect here. What is the best way to prove that it's the MC at fault?

Also, I had the shop replace my (known dead) aux water pump, and when the topped up my coolant they:

1) topped off with the green stuff
2) appear to have added too much

I'm considering draining the whole coolant system just on general principle, but should I be concerned about any harm done with the two mixed like that?

Also - I plan to inspect my current pads, rotors and calipers, but to be honest I will sleep easier at night (and drive better) knowing that I've replaced them. Brakes = safety and I don't want to take any chances there.

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1984 300D Turbo, 326000 Km, Thistle Green Metallic