Subaru IMPREZA 2002 Service Manual page 381

GENERAL DESCRIPTION
BRAKE
7. BRAKE BOOSTER
(1)
Push rod (5) Filter
(9)
Valve body
(2) Return spring
(3) Reaction disc (7) Operating rod (1 1 ) Diaphragm plate
(6) Silencer
(1 0) Plunger valve
(8)
Poppet valve
(12) Valve return spring
(4) Key
BR-I 1