1. Underdrive Brake Band (B4)
2. Outer spring
3. Downshift brake piston rod (B4)
4. Internal spring
5. Sleeve
6. elastic disk
7. Washer
8. elastic disk
9. Washer
10. Underdrive brake piston (B4)
11. Sealing ring
12. locking bracket
13. Sealing ring
14. Underdrive brake cover (B4)
15. thrust ring