TF5-SG2 update on GTR HD brakes test cycle development. Phases include analysis of measured brake cycles from real world data, adjustment of VECTO driver model to meet real world distributions, integration of endurance brake model, and shortening VECTO mission profiles to test cycle candidate. SG2 decided to use VECTO cycles as basis, resulting speed cycle for optimisation, and cycle without road gradients. Next steps include elaborating method to calculate torque and rpm from speed cycle, further shortening cycle to approximately 4 hours, and testing cycle to elaborate quality criterion for reproducibility. Volume flow settings on HD brake dynos require elaboration in SG1.