挂车制动保护阀
trailer braking protecton valve
挂车制动放松阀
trailer braking relax valve
挂车制动应急继动阀
trailer braking relay emergency valve
手控挂车制动阀
hand control brake valve of trailer
铲运机行车制动器致动器
scraper service brake actuator
弹簧松放行车制动器
spring released service brake
电磁停车制动器
electromagnetic park brake
后行车和停车制动器
rear service and parking brake