2. Clean the block using methyl alcohol or clean brake fluid. Never use mineral solvents such as gasoline or paraffin, which attack the rubber components of the system.
3. Remove both rubber dust caps, then use paint to mark the position of the end of the cylinder so that the pistons are not mixed up when reassembling. Remove the pistons and spring.
4. The dust caps should be replaced whenever the wheel cylinder is overhauled, as should the nipple. Inspect all other components, replacing any that show signs of wear, damage, or corrosion. Note that the wheel cylinder may be made by Nabco or Tokyo. Since the components are not interchangeable, always verify the manufacturer of the cylinder when obtaining replacement parts.
5. In particular, check the cylinder bore diameter and piston; they must be accurate and free from scratches, marks or corrosion. Pistons and cylinders are replaced in pairs and must not be interchanged or swapped.
6. Pay special attention to ensure that all components are absolutely clean and dry. The pistons, spring and cylinders must be moistened with brake fluid as a lubricant; dip them in clean liquid before installing.
7. Place the cylinders on the pistons, guiding them accurately by turning them slightly around and using only your fingers to avoid scratching them and set them in the correct position. Insert the first piston into the cylinder, taking care not to damage the cylinder. If the original pistons are reused and have marks formed during dismantling, they must be replaced. Install the spring and the second piston.
8. Install dust caps to each end of the wheel cylinder.
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9. Install the wheel cylinder on the vehicle.
10. Repeat the complete procedure on the opposite wheel cylinder. Always replace both wheel cylinders together to ensure consistent operation of the entire mechanism.