16. REAR BRAKE/REAR FORK/REAR WHEEL/REAR SHOCK ABSORBER K-XCT 125i SERVICE INFORMATION GENERAL INSTRUCTIONS When performing the services stated in this section, the engine and exhaust muffler must be cold to avoid scalding. During servicing, keep oil or grease off the brake pads and brake disk. SPECIFICATIONS Item Standard (mm) Rear brake disk thickness 4.9~5.1 Rear brake caliper piston O.D. 25.33~25.36 Rear brake caliper cylinder I.D. 25.4~25.45 Rear brake master cylinder I.D. 12.7~12.74 Rear brake master cylinder piston O.D. 12.65~12.68 TORQUE VALUES Exhaust muffler lock bolt 35 N-m/3.5 kgf-m Exhaust muffler pipe nut 20 N-m/2 kgf-m Rear axle nut 120 N-m/12 kgf-m Rear shock absorber lower mount bolt 40N-m/4 kgf-m Rear shock absorber upper mount bolt 40N-m/4 kgf-m Rear brake caliper holder bolt 27 N-m/2.7 kgf-m TROUBLESHOOTING Rear wheel wobbling Poor brake performance Bent rim Air in brake system Faulty tire Deteriorated brake fluid Axle not tightened properly Contaminated brake pad surface Worn brake pads Soft rear shock absorber Clogged brake fluid line Weak shock absorber spring Deformed brake disk Damper oil leaks Unequal worn brake caliper Rear wheel noise Worn rear wheel axle bearings Worn rear fork bearings Deformed rear fork 16-1