Keywords: hot spots, temperature of brake disc, coefficient of friction.

In rail vehicles, as a result of the ever-increasing speed, a disc brake is used as a friction brake which gradually displaces the brake-blocks. In public transport vehicles, the electrical traction units or subway; the disc brake collaborates with an electrodynamic brake that limits the use of the friction brake with a simultaneous possibility of power return due to the generator character of the traction engine. Prior to the release of a brake for testing, the tests are carried out on the brake positions, where one of the measurements is of the disc temperature by the use of thermocouples. The decrease of the friction coefficient during braking from high speeds (above 160 km/h) may be affected by both the thermal processes and the phenomenon of a "third" layer in contact with the disc pads prepared from the wear friction pair products. The longer braking times form an additional layer due to the difficulty in the discharge of the waste friction material at the junction of the disc and the pad. This layer increases the pad slip relative to the brake disc. This paper presents the use of a thermal imaging camera while testing the disc brake friction pair elements in the breaking process evaluation.

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