i have a 86 moto 4 and i cant keep brakes on the rear of it. i have replaced the rotor and almost every part in the rear and i only get about 3 big rides out of a set of rear pads. i am using eb severe condition pads. i am a veteran rider ,i use my gears most of the time, so its not improper riding habits. nothing is hanging up. you apply the brakes and it stops , you release the brakes and it rolls freely. need help bad because at 40 bucks a set for pads, if i soon dont figure this out, i will junk the thing . thanks