辅助制动器操纵杆
secondary brake control lever
辅助制动器弹簧力
secondary brake spring force
辅助制动器调整
secondary brake adjustment
辅助制动器工作
secondary brake operation
辅助制动器固定支架
secondary brake mounting bracket
辅助制动器控制阀
secondary brake control valve
辅助制动器控制阀松放
secondary brake control valve release
辅助制动器控制联杆
secondary brake control linkage
辅助制动器旁通油
secondary brake bypass oil