DF4型内燃机车采用单侧、单闸瓦带闸瓦间隙调节器的独立制动系统。机车轮箍踏面为JM3磨耗型踏面,由外至内由1∶10和1∶20两段斜面及不同半径的7段圆弧组成。当闸瓦里外偏磨(一般为外侧厚、内侧薄)时,首先,闸瓦与车轮踏面的接触面积减小,机车制动力降低,制动距离加长,且偏磨后的 DF4 diesel locomotive adopts unilateral and single-brake independent braking system with brake shoe lash adjuster. Locomotive wheel tread for the JM3 wear-type tread, from outside to inside by 1:10 and 1:20 two sections and different radius of seven arcs. When the brake lining outside the partial wear (generally thick outside, thin inside), first of all, the contact area of ​​the brake shoe and the wheel tread is reduced, the locomotive braking force is reduced, the braking distance is longer, and partial wear