... manufacturer and exporter of commercial vehicle parts, covering automatic slack adjusters, manual slack adjusters, spring brake chambers, air brake chambers, brake valves, ... valve,four circuit protection valve,unloader valve,leveling valve,trailer control valve,gland head,elecric coupler,air hose, ... , bpw, shannxi, faw,perkins,cummins, caterpillar,GM and trailer, bus,and so on.. Slack Adjuster