2. REMOVE MAIN PIN BOOT WITH A CHISEL 3. REMOVE PISTON FROM CYLINDER Use compressed air to remove the piston from the cylinder. WARNING: Do not place your fingers in front of the piston when using compressed air. 4. REMOVE CYLINDER BOOT AND SET RING FROM CYLINDER 5. REMOVE PISTON SEAL FROM CYLINDER INSPECTION OF FRONT BRAKE COMPONENTS 1. MEASURE PAD LINING THICKNESS Standard thickness: 10.5 mm (0.413 in.) Minimum thickness: 3.0 mm (0.118 in.) Replace the pad if the thickness is less than the minimum (the 1.0 mm slit is no longer visible) or if it shows sign of uneven wear. 2. MEASURE ROTOR DISC THICKNESS Standard thickness: 20.0 mm (0.787 in.) Minimum thickness: 19.0 mm (0.748 in.) If the disc thickness is less than minimum, replace the disc.