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BENDIX ANTILOCK 4 MODULATOR ASSEMBLY (1) Assemble and install all brake system compo- nents on the vehicle, making sure all hydraulic fluid (2) Bleed the base brake system, using ONLY the bleeding procedure outlined in the Service Adjust- To perform the bleeding procedure on the ABS modu- lator assembly, the battery, battery tray and acid shield (3) Connect the DRB Diagnostics Tester to the vehi- cle’s diagnostics connector. The vehicle diagnostic con- (4) Using the DRB check to make sure the CAB does not have any stored fault codes. If it does, remove them WARNING: WHEN BLEEDING THE MODULATOR AS- When bleeding Antilock modulator assembly, the following bleeding sequence MUST be followed to MODULATOR ASSEMBLY CIRCUIT BLEEDING 1 MODULATOR PRIMARY CHECK VALVE CIRCUIT Note: To bleed hydraulic circuits of the Bendix Antilock 4 Brake System modulator assembly, (1) Install a clear bleed tube (such as Tygon) on primary check valve circuit bleed screw (Fig. 1). Then (2) Pump brake pedal several times, then apply and hold a constant medium to heavy force on brake pedal. (3) Open primary check valve circuit bleed screw (Fig. 1) at least 1 full turn to ensure an adequate flow (4) After brake pedal bottoms, close and tighten bleed screw. Then release brake pedal. Do not release (5) Continue bleeding modulator assembly, repeat- ing steps 2 through 4 until a clear, bubble free flow of (6) When all air is bled from primary check valve circuit, tighten bleed screw and remove bleed hose (7) Torque modulator assembly primary bleed screw to 9 N Im (80 in. lbs.). 2 MODULATOR SECONDARY CHECK VALVE CIRCUIT (1) Move clear bleed tube to secondary check valve circuit bleed screw (Fig. 2). Then install bleed tube into (2) Pump brake pedal several times, then apply and hold a constant medium to heavy force on brake pedal. (3) Open secondary check valve circuit bleeder screw (Fig. 2), at least 1 full turn to ensure an adequate flow Fig. 1 Bleeding Modulator Assembly Primary Check Valve Circuit 5 - 26 ANTILOCK 4 BRAKE SYSTEM Ä |