Front Brake Cylinder Repair (VAZ-2115)

1. Remove the appropriate wheel.

2. Remove the brake hose seal from the bracket on the strut.

3. Loosen the hose fitting on the brake cylinder.

4. Bend back the tabs of the lock washers with a screwdriver and unscrew the two caliper mounting bolts, holding the guide pins by the hexagons with a second key.

5. Remove the bolts and remove the caliper assembly with the cylinder.

6. Using a wrench to hold the hose fitting by the hexagon, unscrew the cylinder from the tip.

Be careful - brake fluid will leak from the hose. Note that there is a copper sealing ring on the nipple. Replace the ring if it is too tight.

7. Clamp the caliper in a vice and remove the two Allen bolts securing the cylinder to the caliper. Remove the cylinder from the caliper.

8. Carefully remove the retaining ring so as not to tear the protective cover.

9. Remove the protective cover from the cylinder.

10. After applying compressed air through the brake fluid supply holes, remove the piston from the cylinder.

11. Carefully, so as not to damage the cylinder mirror, remove the sealing ring.

12. If it is necessary to replace the cylinder or the valve itself, unscrew the air release valve.

13. Carefully inspect the cylinder bore and piston working surface. If any signs of wear, damage or severe corrosion are found, replace the cylinder and piston.

14. Replace the sealing ring if it is damaged, swollen or has lost its elasticity. It is recommended to replace the ring each time the cylinder is disassembled, regardless of its condition.

15. Install a new sealing ring into the cylinder groove, after lubricating it with brake fluid.

16. Insert the edge of the protective cap into the piston groove.

17. Lubricate the cylinder bore and piston working surface with fresh brake fluid. Insert the piston into the cylinder and install the outer edge of the protective cap into the groove of the cylinder body. Install the retaining ring.