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BRAKES
5 - 11
Combination Valve
A two-way combination v a l v e is used on a l l A D
models (Fig. 3). The two-way valve contains a front
b r a k e m e t e r i n g valve a n d a pressure differential
valve and switch.
RESERVOIR
OUTLET TO
FRONT BRAKE
VALVE
S U M
FROM MASTER CYLINDER
(FOR FRONT DISC)
SWITCH ASSEMBLY
FROM MASTER
CYLINDER
(FOR REAR DRUM)
SLEEVE
SPRING
OUTLET TO
FRONT BRAKE
CHECK
VALVE
OUTLET
TO
REAR
DIFFERENTIAL
J
^ ^
t
™ BRAKES
PISTON
a
W N G
R N 1 0 5 3
Fig. 3 Two-Way Combination Valve
MASTER CYLINDER REMOVAL
(1) Disconnect t h e p r i m a r y a n d secondary b r a k e
tubes a t the master cylinder.
(2) I n s t a l l plugs i n t h e c y l i n d e r o u t l e t ports a n d
b r a k e tubes t o prevent d i r t e n t r y .
(3) Remove t h e n u t s a t t a c h i n g master cylinder t o
t h e power brake booster.
(4) Remove t h e master c y l i n d e r f r o m thfe power
b r a k e booster m o u n t i n g studs.
MASTER CYLINDER SERVICE—TWO-SECTION
CYLINDER
T h e only s e r v i c e a b l e c o m p o n e n t o n t h e t w o -
section c y l i n d e r i s the n y l o n r e s e r v o i r . I f t h e c y l -
i n d e r body o r i n t e r n a l c o m p o n e n t s a r e w o r n o r
damaged, the c y l i n d e r b o d y m u s t b e r e p l a c e d a s
a n assembly.
RESERVOIR
REPLACEMENT-TWO-SECTION
CYLINDER
(1) Clean t h e reservoir exterior a n d master c y l i n -
der body.
(2) Remove t h e reservoir caps a n d d r a i n a l l f l u i d
f r o m the reservoir.
(3) M o u n t the master cylinder i n a vise. C l a m p the
vise jaws on the a l u m i n u m body.
(4) Note position o f the reservoir before removal.
(5) Remove the reservoir b y f i r m l y r o c k i n g i t f r o m
side t o side (Fig. 4). Continue r o c k i n g u n t i l t h e res-
e r v o i r is free of the grommets.
Fig. 4 Removing/Installing Cylinder Reservoir
(6) Remove and discard t h e grommets t h a t secure
the reservoir i n the cylinder body.
(7) I n s t a l l new reservoir grommets i n the cylinder
body.
(8) Lubricate t h e n e w reservoir grommets
w i t h
clean brake f l u i d .
CAUTION: The reservoir can be installed backwards
if care is not excercised. Install the reservoir so the
fluid fill information (on the reservoir side) is on the
same side as the fluid outlet ports in the cylinder
body (Fig. 4).
(9) S t a r t t h e reservoir into t h e grommets. Then
rock the reservoir side t o side u n t i l f u l l y seated. The
reservoir bottom surface should touch the grommets.
(10) Bleed t h e master cylinder before i n s t a l l i n g i t
on the vehicle. Refer t o the procedure i n t h i s section.
MASTER CYLINDER SERVICE-INTEGRAL
CYLINDER
The i n t e g r a l (one-piece) cylinder is a f u l l y service-
able component. I t can be overhauled t o restore per-
formance w h e n necessary. Overhaul procedure i s as
follows.
INTEGRAL
CYLINDER
DISASSEMBLY
AND
INSPECTION
(1) Remove the cylinder cover (Fig. 5).
(2) D r a i n the f l u i d f r o m the cylinder reservoirs.
(3) M o u n t the cylinder i n a vise.
(4) Press t h e cylinder pistons i n w a r d w i t h a wood
dowel and remove the the piston snap r i n g (Fig. 6).
(5) Remove t h e p r i m a r y piston assembly from t h e
cylinder bore. Discard t h e piston assembly.
(6) I f cylinder is equipped w i t h piston stop screw
for secondary piston, remove the stop screw before
proceeding.
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