1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 181Get this manual
REAR WHEELBRAKE DRIVE MECHANISM
TROUBLESHOOTI NG
Wobble or vib ratio 1Bent rim 2Loose wheel bearing 3Faulty rear axle bearing holder 4Faulty tire 5Axle not tightened properly Poor brake perfo rmance 1Improper brake adiustment 2Worn brake shoes 3Brake linings oily, greasy or dirty 4Worn brake cam Worn brake drum Brake arm serrations improperly engaged 7Brake shoes worn at cam contact area