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. INSPECT BRAKE SHOE / LINING 3. To maintain the efficiency of the brake system, preventive maintenance is essential. At specified interval remove the brake drum and check the lining for wear. The lining must not be allowed to wear down below 1 mm from rim surface. Increased foot pedal travel and hand brake lever movement is an indication that automatic adjustment mechanism has reached its end. The lining shoes need replacement in pair on both sides of the axle. Always fit new shoe return spring when fitting new shoe. Do not polish lining with sandpaper or emery paper. If lining is polished with sandpaper or emery, hard particles of sandpaper will be deposited on the lining resulting in damage of drum surface. Whenever lining is to be corrected, replace it with the new one. Always use genuine grade of service replacement lined shoes. Do not contaminate the lining surface with oil or grease. OVERHAULING OF WHEEL CYLINDER 4. Overhaul the wheel cylinder at specified interval. In any case, after a specified interval, the wheel cylinder should be replaced. The wheel cylinder may be serviced using parts from appropriate repair kit, provided the plunger and the bore are in good condition without any damage. INSPECTION OF WHEEL CYLINDER 5. Examine the wheel cylinder bore and the piston. If they are not scored, corroded or ridged and are smooth to touch, new seals can be fitted. If there is any doubt about the condition of the bore, a new cylinder must be installed. Inspect the wheel cylinder dust cover for cuts, cracks, hardening or other sign of deterioration. If in doubt, replace the dust cover. If the system has been contaminated with mineral oil of any type, the system should be flushed out with fresh brake fluid or alcohol and all rubber parts including hoses should be replaced. (Exploded View of wheel cylinder) For identification, a contaminated seal can be compared with a new seal (but do not allow them to touch). If the old one is appreciably larger, seal contamination is indicated. Whenever wheel cylinders are serviced, replace seals and dust covers from appropriate wheel cylinder kit. FLUSHING BRAKE HYDRAULIC SYSTEM 6. 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. BRAKES 27
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