BRAKE 21 D. BLEEDING PROCEDURE A normal bleeding procedure can be employed whenever: Replacing calieprs or Drum Brakes. Replacing of brake hoses. Any hydraulic connection is loosened for any purpose. Spongy / Soft brake pedal or pedal travel high complaint. NOTE: Remove the LV battery –ve terminal & I-VBAC ECU (46 pin) connector prior to bleeding. Carefully clean all dirt from around the reservoir filler cap. Remove the filler cap; fill the reservoir with fresh brake fluid to the Maximum marking indicated on the reservoir. Before commencing bleeding, at each bleed screw, remove the dust cap and clean thoroughly. The sequence for bleeding the system is as shown. Attach transparent (vinyl) bleed tube to the bleeder screw top of the Left caliper and insert the other end into a clean glass container containing recommended brake fluid to submerge the end of the tube. Depress brake pedal slowly throughout the full stroke of the pedal and then holding it depressed, loosen bleeder plug about one-third to one-half turn. This is sufficient to allow the brake fluid to flow freely. NOTE: It is always better to close the bleed screw at the end of each downward pedal stroke to ensure full recuperation of brake fluid in the system. There should be an interval of 3 to 4 seconds before making the next stroke. This action should be repeated until bubbles of air cease to appear at the end of the bleed tube. 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. Ensure that the fluid level in the master cylinder reservoir does not fall low enough to cause air to be drawn into the system, throughout the bleeding operation. Repeat the same procedure on the rear right wheel cylinder, followed by right caliper followed by the rear left wheel cylinder. If the bleeding of any cylinder continues without success for a considerable time, it may be that air is being drawn in past the bleed screw threads. In such instances, the bleed screw should be closed at the end of each downward stroke of the pedal, allowing the pedal to return fully to its stop before re-opening. Tighten the bleed screw finally after the last downward stroke of the pedal. Replace the dust cap on the bleed screw. Connect the LV battery –ve terminal & I-VBAC ECU (46 pin) connector after bleeding. After completion of bleeding, apply the brake pedal hard and check for any leak at the joints and bleed screws. Also check the brake pedal for “sponginess”, If found spongy, repeat the complete procedure of bleeding or go for software bleeding. 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. SERVICING OF MASTER CYLINDER NOTE: Servicing of the fixed seal master cylinder internal parts are not recommended and if a major fault is apparent, a new complete guaranteed unit should be fitted.
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