4. Close the bleed screw immediately after the last downward stroke of the pedal. Whilst the pedal is thus held, securely tighten the bleed screw to recommended tightening torque and remove the tube. Replace the dust cap on the bleed screw. 5. Repeat the same procedure on front left, front right, rear right. 6.The brake bleeding device should be switched/plugged OFF after base brake bleed is completed. Verify bleeding result: Execute IVBAC Leakage • and Air Monitoring Evaluate results of IVBAC Leakage and Air • Monitoring: a. If Volume consumption and leakage rate gets passed then Proceed with removing brake bleeding • device. b. If too high calculated volume consumption detected Execute “Repair Bleed” routine using • the Tata Diagnostic Tool follow the steps mentioned in the Tata Diagnostic tool to complete the Repair bleed process. Execute IVBAC Leakage and Air • Monitoring and evaluation again. c. If too high calculated leakage in backup circuit detected Check that all bleedings screws are • closed and check all IVBAC connections which were opened during replacement Execute IVBAC Leakage and Air • Monitoring and evaluation again. d. Detection of b)+c): First check c) with execution of IVBAC Leakage and Air Monitoring. Then do b) with execution of IVBAC Leakage and Air Monitoring Remove brake bleeding device. • Important: Adjust proper brake fluid level. • Execute VCP-Valve Comfort Pulse-Calibration. • Deactivate “Assembly Mode” using the Tata • Diagnostic Tool and unplug the Tata Diagnostic Service. Turn Ignition ON, check that all warning lamps • are OFF. Pre Delivery checks after IVBAC Bleeding procedure 1. BRAKE FLUID LEVEL INSPECTION After completion of brake bleeding, check the brake fluid level in the reservoir. The fluid level should be between MIN and MAX level indicated on the brake master cylinder reservoir. If the warning light lights during Engine ON condition replenish fluid to MAX line. Never use container which has been used for mineral oil or which is wet. Always keep all brake fluid container capped to prevent contamination. 2. BRAKE FLUID LEAKS Check the master cylinder fluid levels. An abnormally low level indicates a leak in the system. In such a case, check the entire brake system for leakage. The cause should be corrected and defective parts should be replaced. Note that a slight drop in the fluid level does result from normal wear of brake lining. 3. BRAKE TROUBLE SHOOTING Before starting to “Brake trouble shooting” inspect the vehicle brake hydraulic system and brake system components. It is strongly recommended to inspect the following before the actual road test. a. Apply and hold the brakes. Check for brake fluid leakages at all connections and correct as necessary. b. Repeatedly apply and release the brakes to observe brake shoe motion. If either brake is slow to respond, investigate for binding and/or airlock restriction. c. Brake fluid level in the reservoir / connector d. Brake pads / Brake shoes e. Brake Drum / Disc / Caliper Brake system for corrosion, chafing and f. damage from road stones (Visual Inspection) g. Ensure correct tyre pressure and check for tyre wear 4. CONTAMINATED BRAKE FLUID Improper brake fluid or water / other mineral oil ingress in the fluid may cause the brake fluid to boil or deterioration of the rubber components in the hydraulic system. If the piston seals are swollen, then rubber parts have deteriorated. If deterioration of rubber is evident, disassemble all hydraulic parts and wash with alcohol. NOTE Consider 10 min cooling time after execution • of repair bleed. BRAKES 36
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