Dakota 4WD V6-3.9L VIN X (1997)
Brake Caliper: Testing and Inspection
Fig 14 Honing Piston Bore
PISTON INSPECTION
The piston is made from a phenolic resin (plastic material) and should be smooth and clean. Replace the piston if cracked or scored. Do not
attempt to restore a scored piston surface by sanding or polishing. The piston must be replaced if damaged.
CAUTION: If the caliper piston must be replaced, install the same type of piston in the caliper. Never interchange phenolic resin and steel caliper
pistons. The pistons, seals, seal grooves, caliper bore and piston tolerances are different for resin and steel pistons. Do not intermix these
components at any time.
BORE INSPECTION
The bore can be lightly polished with a brake hone to remove very minor surface imperfections. The caliper should be replaced if the bore is
severely corroded, rusted, scored, or if polishing would increase bore diameter more than 0.001 inch.
