1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 183Get this manual
REAR WHEE LBRAKE DRIVE MECHANISM While holding the breaker arm assembly at an ap proximate 45 position, insert the blade of the breaker arm between the tire and rimPush the breaker arm inward and downward unt il it is in the horizontal position with its press block in contact with the rimNOTE
BREAKER RM ASSEMBLY
It may be necessary to tap the breaker arm with brass hammer to install it the last 3
mmWhile doing so, be sure to hold the arm down in the horizontal position
THRE DED SHAFT ADAPT ER
With the breaker arm in the horizontal position, place the breaker press head assembly over the breaker arm press blockMake $Ure the press head bolt is backed out all the way and then position the nylon buttons on the press head against the inside edge of the rim Insert the threaded shaft through the appropriate hole in the breaker press head assembly and then tighten the lever nut until both ends of the breaker press head assembly are in firm contact with the rim
PRESS HEAD BOLT -LEVER NUT 11" RIM