1981-1984 Official Honda ATC250R Shop Manual, Page 145Get this manual
ATe 250R
REAR WHEElBRAKEDRIVE MECHANISM
TROUBLESHOOTING
Wobble or vibration in vehicle 1Bent rim 2Loose wheel bearing 3Faulty rear axle bearing holder 4Faulty tire 5Axle not tightened properly Poor brake performance 1Improper brake adjustment 2Worn brake shoes 3Brake linings oilygreasy or dirty 4Worn brake cam 5Worn brake drum 6Brake arm serrations improperly engaged 7Brake shoes worn at cam contact area