Certainly, more than happy to help out!
The rear needs to be turned because of the design of the VAG parking brake. When the parking brake lever is pulled, the cable pulls a lever on the caliper, which turns the piston and puts force on the rear discs. Some other manufactures use a differnt method for engaging the parking brake, but almost all VAG cars (VW, Audi, etc...) with rear discs will need to have the rear piston turned while it is being compressed.
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