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(5). Brake disk shall be replaced when the wear limit 10mm is reached. Remove brake caliper shell first before replacing brake disk. Dirt and preservative oil on friction surface of new brake disk shall be evenly removed before installation. (II). Replacing Friction Shoes of Front Wheel Disk Brake (1). Lift the car and demount front wheel, then remove lower fastening bolt of brake caliper shell. (2). Lift up brake caliper from bottom to top and demount brake shoe as shown in the figure. (3). Press brake caliper piston back into the shell. Check the brake fluid tank level before pressing piston back, and suck some out if the level is too high so as to prevent fluid from overflowing and damaging paint. Brake fluid is corrosive and toxic, therefore shall be stored in special plastic bottle or other container. (4). Fix the inside brake shoe on caliper bracket of steering knuckle, and then fix outside brake shoe. (5). When fixing brake caliper, make sure that the retracing spring on brake shoe is properly positioned, otherwise brake noise will be caused. (6). After assembly is finished, fully operate brake pedal for several times with the car unmoved to set brake shoes in normal working position. (III). Replacing Packing Ring in Brake Caliper Shell Wheel Cylinder The packing ring in brake caliper shell wheel cylinder shall be replaced in case of aging failure and brake fluid leakage. (1). Loosen and remove brake caliper set bolts, and take off the caliper to be hung on an iron wire. (2). Press the piston out of caliper shell by compressed air. Place a wood block in piston slot when pressing to avoid piston damage, as shown in the figure.
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