The necessity to mount the empty/load brake equipment on heavy haul freight cars due to change of the gross-to-tare ratio in order to reduce empty-car brake cylinder pressures is analyzed.

• 分析了重载货车因空重比的改变而加装空重车调整装置,以降低空车制动缸压力的必要性,同时分析了低制动缸压力对制动效率、制动缸活塞行程等的影响,认为纯制动率是影响制动效率的主要因素。