1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 193Get this manual
BRAKES FRONT BRAKE WATERPROOF SEAL INSPECTION (After '87) Check the front brake waterproof seal for damage, fatigue or improper installationMeasure he front brake waterproof seal lip lengthSERVICE LIMIT: 20.0 mm (0.79 in)
FRONT BRAKE WATERPROOF SEAL REPLACEMENT (After '87)
Remove the waterproof seal from the brake drum by prying open the seal edgeRemove the wheel hub CALCULATE THE CLEARANCES BETWEEN THE DRUM AND SEAL Measure and record the drum and seal length of a, b, and as shownCalculate the clearances and between the drum and sealB =d- =a- c
Apply water to the whole of new waterproof sealPlace waterproof seal on clean surface plate, and press the brake drum into the waterproof sealmaking sure that the clearances between the seal and drum will reach the calculated clearance (see above)CAUTION