English to German Tech/Engineering Engineering (general) torque measuring

This is a chapter from the manual of a torque wrench:

5.5.1.10 Loose peak
This test lets measure the residual torque by loosing an already tightened screw. The result of the test will be the peak of the torque acquired during the unscrewing.

Of course I understand what the sentence below the title means, but I need an expression for the title. Can anybody help?

TIA