16. BRAKE SYSTEM MXU550EXi/MXU500i RELAY VALVE REMOVAL/DISASSEMBLY/INSP ECTION/ASSEMBLY/ INSTALLATION (ON ROAD) REMOVAL Drain brake fluid (refer to the "COMBINATION BRAKE FLUID CHANGE/AIR BLEED (ON ROAD)" section in this chapter). Do not splash brake fluid onto any rubber, plastic and coated parts. When working with brake fluid, use shop towels to cover these parts. Remove all fluid hoses bolts/washers and then disconnect the all fluid hoses. When removing the brake fluid hose bolt, be sure to place towels under the hose and plug the hose end to avoid brake fluid leakage and contamination. Remove the two mounting bolts and remove the relay valve. Bolt DISASSEMBLY Remove the bolt. Remove the spring. Spring 16-31