POWER BOOSTER REPAIR (Cont).
Install new O ring (25) onto spool
valve plug (26). Push spool valve plug
into housing (9). Install spool plug
retaining ring (27) and ensure that it
is fully seated. Install spool return
spring (24) and spool valve assembly
Coat rod and piston unit (17) with
clean hydraulic fluid. Position housing
(9) over cover (20) and slide pins on
piston lever into groove on spool
valve. Using a screwdriver to carefully
depress lip of piston seal (15), slide
housing and piston onto cover.