BRAKE SYSTEM 509 BRAKES BLEEDING OF HYDRAULIC SYSTEM The process of removing air from the hydraulic pipe line and cylinders is known as “Bleeding”. Bleeding operation should be carried out; whenever you have worked on the brake system (Dismantled any hydraulic brake part, e.g. wheel cylinder, TMC, brake hose etc.) When seals are worn, it is possible for the air to enter the wheel cylinders without any sign of fluid leaking, causing a ‘Spongy’ pedal which is the usual indication of air in the system. It is vital that absolute cleanliness is maintained throughout the entire bleeding operation.All equipment to be used must be entirely free from petrol, kerosene or any form of mineral oil, as mineral contamination spreads rapidly in the hydraulic system, causing a dangerous deterioration of the rubber seals. Always replace the rubber dust cover on each bleed screw to prevent dirt entering the bleed tube during subsequent bleeding operation. CAUTION: 1. Brake fluid may cause damage to paint. So make sure that brake fluid does not touch the painted surface. In case brake fluid comes in contact with painted surface, wipe immediately & clean the surface with water. 2. Always use recommended brand of brake fluid. 3. Do not use the fluid bled from the system for refilling in to the reservoir. 4. For effective brake bleeding use pressurized systemand transparent bleeder tube. The bleeding bottlemust be held above the level of wheel cylinder for effective scavenging of air from the system. Bleeding Procedure is as follows: Following points should be noticedwhile brake bleeding process. • Brake fluid from sealed container of 250 or 500 ml to be used. • Once some brake fluid is consumed fromcontainer, the container should be discarded. • Separate funnel to be used for filling brake fluid in the brake fluid reservoir, that funnel should not be used for any other purpose. • Separate transparent tube to be used for removing oil during bleeding. That tube to be used only for brake bleeding purpose. • Bleed bottle should be separate from the brake fluid bottle. • Bleeding Kit to made. The Kit should contain bleeding bottle, transparent plastic tube, funnel for filling, sealed brake fluid, spanner, cotton waste (cloth) for bleeding purpose. • Bleed oil should be scrapped. • For topping up only closed container of 100 or 250 ml to be used. NOTE: Always bleed the system in a following sequence. It should be such that, the farthest side from the TMC should be bled first. So here it will be REAR LEFT followed by Rear Right, Front Left and Front Right respectively.
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