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东风4型内燃机车配置的JZ－7型空气制动机设置有作用间，根据作用风缸的压力变化，作用阀产生制动、保压、缓解作用，当作用间膜板上方缓解弹簧损坏失效或空心问杆O型图阻力过大（尤其是在冬季的三九严寒的气温下），制动缸增压后需要缓解时，便不能降为零，特别是在制动缸增压
JZ-7 type air brake equipped with Dongfeng 4 diesel locomotive is provided with an action room. According to the pressure change of the acting air cylinder, the acting valve generates braking, holding pressure and relieving effect, and when the acting diaphragm plate is relieved, the spring damage failure Or hollow asked the O-diagram of the resistance is too large (especially in the winter temperature of 39), brake cylinder booster need to be relieved, they can not be reduced to zero, especially in the brake cylinder pressure