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The best way to remove threadlock residue from threads is with a wire brush.
A decent torque wrench is a good investment, I'd recommend either buying or borrowing one for this. Most M8 disc bolts...

Check both sides of the new disc to see if the bolt boles are counter-bored (recessed) on one side - if they are, this in the side that the bolt head sits in so it faces away from the wheel. This...