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This work focuses on the study of transient phenomena, in particular the non-uniformity and space-time variation of friction forces and surface temperature of a brake disc during stop-braking. Friction tests were conducted on a braking tribometer. The friction forces in the contact were measured using a 3D piezoelectric sensor, while the disc surface temperature was investigated by means of a high frequency fibre-optic two-colour pyrometer. An optical lap-top device was used to keep track of disc revolutions, and an original programme was written to plot the space-time variations of the measured parameters. This new original approach helps better understand the coupling between thermal and tribological phenomena occurring during braking.