BRAKES 22 DISC INSPECTION: The disc should be free from score marks. If scored, it should be ground and refitted. Do not grind the disc more than 0.25mm per side. If the total thickness of the disc after grinding is found to be less than disc discard thickness of 20 mm, the disc 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 0.03 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. 10.2. REAR BRAKE MAINTENANCE: To maintain the efficiency of the brake system, preventive maintenance is essential and the following recommendations should be observed at the intervals stated. 1. At specified interval remove the brake drums and check the lining for wear. The linings should not be allowed to wear less than 1 mm from the shoe rim. 2. At specified interval clean the back plate and lubricate the tips of the shoe platforms and the moving parts of the adjuster. Keep the grease away from the shoe linings and all hydraulic parts. BRAKE HOSES Replace Brake hoses at specified interval. DRUM INSPECTION: Inspect the drum for cleanliness. Check for crack, scores etc. Check braking surface for its wear by measuring the inside diameter. Brake drum inside dia. Standard Service limit 200 202 Whenever brake drums are removed, they should be thoroughly cleaned and inspected for cracks, scores, deep groove etc. Visual inspection of wheel cylinder for brake fluid leakage is to be performed. Drum to be discarded, if found cracked, scored badly or grooved. Do not to weld a cracked drum. It is unsafe and must be replaced. Smooth up any slight scores, Heavy or extensive scoring will cause excessive brake lining wear and it will be necessary to resurface drum-braking surface. If brake linings are slightly worn and drum is grooved, drum should be polished with fine emery cloth but should not be turned.
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