In the paper, the study of giving out heat characteristic of wet multiple brakes was introduced. Temperature calculation of wet multiple brakes was probed. The change rule of inner oil temperature in wet multiple disk brake was studied when braked. Mathematical model of unsteady state heat transfer was established in wet multiple disk brake on the basis of theoratical and experimental research. It was proved that the calculation result is conform to the test one. Choicing appropriate work cycle on wet multi...