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 cylinder end so that the pistons are not mixed up during reassembly. Remove the pistons and spring.
4. Dust caps must be replaced whenever the brake wheel cylinder is repaired, as well as the fitting. Examine all other components, replacing any that show signs of wear, damage or corrosion. Note that the brake wheel cylinder can be made by Nabco or Tokico. Since components are not interchangeable, you must always identify the cylinder manufacturer when obtaining replacement parts.
5. In particular, check the cylinder bore and piston; they must be accurate and free of scratches, marks or corrosion. Pistons and cylinders are replaced in pairs; changing or interchanging them is unacceptable.
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 installation.
7. Place the cylinders onto the pistons, guiding them accurately, turning them around slightly and using only your fingers to avoid scratching and position them in the desired position. Insert the first piston into the cylinder, taking care not to damage the cylinder. If the original pistons are reused and have marks caused by removal, they will need to be replaced. Install the spring and second piston.
8. Install dust caps to each end of the brake wheel cylinder.
9. Install the brake slave cylinder on the vehicle.
10. Repeat the complete procedure on the opposite brake wheel cylinder. Always replace both brake wheel cylinders together to ensure compatible operation of the entire mechanism.