| 1. Purify dust and dirt from the working brake cylinder. |
| 2. Remove dustproof covers from each end of the brake cylinder. |
| 3. Take both pistons with sealing rings from the brake cylinder. Pistons are usually pushed out by spring pressure. Otherwise squeeze out pistons, giving compressed air under low pressure to an opening for supply of brake fluid. |
| 4. Check a condition of pistons and the brake cylinder for wear, corrosion and other defects. |
| 5. With defects replace the working brake cylinder assembled. Keep in mind that the brake cylinder which was installed on earlier models can be replaced with the brake cylinder which is installed on later models. |
| 6. Replace sealing rings irrespective of their state. |
| 7. On models since 1992 L-shaped sealing rings of the piston are established. |
Prevention
Keep in mind that the repair kit of details of the brake cylinder of early type is not compatible to details of the modified brake cylinder.
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| 8. Grease sealing rings of the piston with pure brake fluid and install them in cylinders, having inserted between them a spring. |
| 9. Dip pistons into pure brake fluid and install them in the working brake cylinder. |
| 10. Establish dustproof covers. |
