VESPA 664787 Service Station Manual page 124

Braking system
CAUTION
ALL THE SEALS AND GASKETS MUST BE REPLACED EVERY TIME THE PUMP IS SERVICED.
1. Reservoir cap screw
2. Reservoir cap.
3. Diaphragm.
4. Bellows.
5. Sealing ring
6. Piston.
7. Gasket.
8. Spring.
9. Reservoir
Refitting
To refit, carry out the removal operations but in reverse order, observing the specified torques.
N.B.
USE NEW COPPER GASKETS ON THE JOINTS.
CAUTION
ONCE REFITTING IS FINISHED, BLEED THE SYSTEM.
Locking torques (N*m)
Oil pipe joint to the pump: 20 - 25 Brake pump fixing screws to the handle bar: 7 ÷ 10 Nm Pipe /
brake calliper coupling 20 ÷ 25
BRAK SYS - 124
Vespa S 50 2T