3. BRAKE BLEEDING THROUGH SOFTWARE In below mentioned specific cases, bleeding process known as “ABS Secondary Circuit Bleeding” is to be employed. In this method solenoid valve and the pump motor are actuated by Software based TML - diagnostic system. If customer service intervals are exceeded 5 • yrs. or more. If TMC or I-VBAC is replaced. • Any hydraulic connection between TMC & I- • VBAC is loosened. Spongy / Soft brake pedal or pedal travel high • complaint. 4. BLEEDING PROCEDURE 1. Do normal manual bleeding at the four wheels in specified sequence previously. 2. Connect the LV battery –ve terminal & I-VBAC ECU (46 pin) connector. Turn on the vehicle ignition to “READY” to avoid LV battery discharge. during repair bleeding process. After that connect the diagnostic tool & run the ‘Repair bleed’ command. It will take around 20~25 minutes to complete this process. 3. Again do the normal manual bleeding at the four wheels in specified sequence previously. 5. 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. 6. 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. Apply and hold the brakes. Check for brake • fluid leakages at all connections and correct as necessary. 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. Brake fluid level in the reservoir / connector • Brake pads / Brake shoes. • Brake Drum / Disc / Caliper • Brake system for corrosion, chafing and • damage from road stones (Visual Inspection) Brake lag • Ensure correct tyre pressure and check for tyre • wear. 7. 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. Dry these parts with compressed air before assembly to keep alcohol out of the system. Replace all rubber parts in the system including hoses. Also when working on the brake mechanisms, check for fluid on the linings. If excessive fluid is found, replace the linings. If master cylinder piston seals are satisfactory, check for leakage or excessive heat conditions. If condition is not found drain fluid, flush with brake, refill and bleed the system. The system must be flushed inferior quality fluid is found in the system. NOTE For every manual bleeding disconnect the LV battery –ve terminal & I-VBAC ECU (46 pin) connector. NOTE During repair bleeding process no need to open a nd close bleeders at wheel ends. It will only operate the valves inside the I-VBAC. No external intervention is required. NOTE Observe the brake fluid level, & top-up as necessary. BRAKES_LR 26
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