Chevrolet 1980 Light Duty Truck Repair Manual page 166

5-30 BRAKES
4. Remove And Install Spool Valve, Power Piston/Acuumulator And Seal.
1. Remove parts as shown.
2. If rem oving spool valve plug
refer to Remove and Install
Spool Valve Plug In Car.
H OUSING COVER
POWER P IS T O N /A C C U M U LA T O R
POWER P IS T O N /A C C U M U LA T O R
SPRING
R EM O VE POWER P IS T O N /A C C U M U LA T O R SPRING
BE SURE SPOOL
V A L V E IS EN G AG E
IN S T A L L SPOOL V A L V E
OVERHAUL MANUAL
R E M O VE
HOU SIN G S E A L
SPOOL V A L V E
O U TP U T ROD
(R E T A IN E D BY
" 0 " R IN G )
SC RE W D R IVE R
SPOOL
V A L V E
IN S T A L L
1. Install parts as shown.
2. If installing spool valve plug
refer to Remove A n d Install
Spool Valve Plug In Car.
R E TU R N PORT
F IT T IN G
HO U SIN G
PISTON S E A L
(W HEN IN S T A L L IN G SPRING
PUSH SPR IN G U N T IL IT SEATS
B O LT
B E H IN D LED G E HOUSING
27 N -m (20 FT. LBS.)
PISTON
S EAL
IN S T A L L POWER P IS T O N /A C C U M U L A T O R S E A L
W HEN R E P LA C IN G POWER
P IS T O N /A C C U M U LA T O R
D R IL L A 1 /8 " H O LE BEFORE
DISPOSING
DISPOSE POWER P IS T O N /A C C U M U L A T O R
SPOOL V A L V E
SLE EV E
POWER PISTON
R E T U R N SPRING
C L E A N GRO O VE
B O TT O M BEFORE
IN S T A L L IN G S E A L
H O U S IN G