Brake operation diagram (VAZ-21213)

1. Brake pads; 2. Clamping lever axis; 3. Shoe guide; 4. Caliper pressure lever; 5. Brake caliper; 6. Piston sealing ring; 7. Primary circuit wheel cylinder pistons; 8. Secondary circuit brake hose; 9. Cylinder block; 10. Brake disc; 11. Primary circuit drive piston of the master cylinder; 12. Brake hydraulic fluid reservoir; 13. Movable contact; 14. Fixed contact; 15. Float; 16. Vacuum valve; 17. Vacuum booster valve body; 18. Diaphragm; 19. Amplifier pin; 20. Rod buffer; 21. Amplifier housing cover; 22. Vacuum booster valve; 23. Valve return spring; 24. Valve tappet; 25. Pedal release spring; 26. Brake light switch; 27. Brake light switch tip; 28. Brake pedal; 29. Valve spring; 30. Piston; 31. Valve body return spring; 32. Rod; 33. Rod seal; 34. Sealing ring; 35. Piston stroke limiting screw; 36. Bushing; 37. Secondary circuit drive piston; 38. Seal; 39. Secondary circuit pipeline; 40. Brake pads; 41. Rear brake wheel cylinder piston; 42. Piston seal; 43. Thrust rings; 44. Pressure regulator drive lever; 45. Sealing ring; 46. Spring plate; 47. Piston head seal; 48. Housing bushing; 49. Pressure regulator piston; 50. Pressure regulator housing plug.

A. Vacuum cavity; B. Channel connecting the atmospheric cavity with the internal cavity of the valve body; C. Channel connecting the internal cavity of the valve body with the vacuum cavity; K. To the engine intake pipe; D. Atmospheric cavity.

I. The pedal is not pressed; II. Disinhibition; III. Braking.