Removal Disassemble in the order of the pedal section, the primary valve section and the secondary valve section 2.Wipe clean or wash the disassembled parts as follows: A Rubber parts Wipe clean with cloth, etc moistened with alcohol B Metallic parts(excluding plate assembly and pedal) Wash in cleaning solution and blow with air to dry for complete removal of cleaning solution Before disassembly, remove dirt and dust thoroughly from the surface and work carefully to prevent ingress of foreign matter, dust, dirt and muddy water Before dissemble, put an alignment mark each joining portion Never wash rubber parts in cleaning solution Installation Install the primary piston 2.Install the relay piston O-ring(A) Disassembly Loosen the screw(A) 2.Remove the retaining ring(A) Reassembly Adjustment Mount an air pressure gauge(A) 980 kpa (10 kgf.cm²) to the primary outlet port around the air brake valve Mount a foot pressure gauge(B) to the air brake valve pedal Then, set the air tank pressure to 685 kpa (7 kgf/cm²) and check each section for air leaks 2.Slowly depress the pedal to check for braking force build up Brake pedal travel Referring to the characteristic diagram, check the relationship among the pedal depressing angle (pedal travel), air output pressure and foot pressure If the output pressure is low, replacement of springs is necessary