The stability of the braking efficiency depends on the sensitivity of the efficiency coefficient k of the friction coefficient f. The friction coefficient f is an unstable coefficient. In addition to materials, the main factors affecting the coefficient of friction are mainly the surface temperature and water moisture of the friction pair, where temperature plays an important role, so the thermal stability of the brake is especially important. Therefore, the low sensitivity brake type for the efficiency factor k for the coefficient of friction should also have good counterlapse and recyclable properties of the friction material, and the brake disc should have sufficient thermal capacity or a certain thermal conductivity.