13. REAR WHEEL/SWING ARM/ HYDRAULIC BRAKE ATV 150/125 INSPECTION Check the piston for scratches or wear. Measure the piston O.D. with a micrometer gauge. Service limit: 33.85 mm (1.654 in) Check the caliper cylinder for scratches or wear and measure the caliper cylinder I.D. Service limit: 34.05 mm (1.362 in) ASSEMBLY Clean all removed parts. Apply silicon grease to the pistons and oil seals. Lubricate the brake caliper cylinder inside wall with brake fluid. Install the oil seals and then install the brake caliper pistons with the grooved side facing out. Install the piston with its outer end protruding 35mm beyond the brake caliper. Wipe off excessive brake fluid with a clean shop towel. Apply silicon grease to the brake caliper holder pin and caliper inside. Install the brake caliper holder. 13-24