BRAKE 20 5. DISC INSPECTION: The disc should not have heavy score marks. If scored, it should be changed. The disc thickness variation is to be checked by measuring the thickness of the rotor at four or more points around the circumference of the rotor. All measurements must be made at the same distance from the edge of the rotor. After fitment, the face runout of the disc should be less than 0.06 mm. During measurement, confirm the dial gauge probe should be approx. 10 mm from the outer edge of the brake rotor, perpendicular to the disc and under slight preload. Check front wheel bearing for looseness before face runout measurement. The control of the braking surface finish is necessary to avoid pulls and erratic performance. It will also help in extending pad life. 6. FLUSHING BRAKE HYDRAULIC SYSTEM It is always recommended that entire hydraulic system be thoroughly flushed with clean brake fluid whenever new parts are installed in it. Period change of brake fluid is also recommended. 7. BLEEDING OF HYDRAULIC SYSTEM: The process of removing air from the hydraulic pipelines and cylinder is known as “Bleeding”. The brake hydraulic lines are based on diagonal split system. Whenever any brake line or hose is disconnected at the wheel, bleeding operation must be performed at both the ends of the line of the removed pipe or hose. (I.e. if the rear left side brake pipe or hose is disconnected, both the rear left and front right side of the system is to be bleeded). When any joint part of the Master cylinder, other joint part between the master cylinder and each brake of the wheel is removed or the level of brake fluid in the reservoir has been allowed to fall so low that the air has been drawn into the system, then the hydraulic brake system must be bleed at all 4 wheel brakes. NOTE: Use only DOT4 brake fluids confirming to SAE J1704 from a sealed container. Ensure brake fluid is not contaminated. As the hydraulic lines of brake system are of DIAGONAL SPLIT, always perform bleeding operation starting with the caliper farthest from master cylinder and then at the rear brake assembly of the same brake circuit. Repeat the same on the other brake circuit also. Brake fluid may cause damage to paint. So make sure that brake fluid should not touch the painted surface, if it accidentally touches the painted surface, wipe immediately and clean the surface.
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