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BRAKES
•
MASTER CYLINDER—COMBINATION V A L V E - B R A K E L I N E S
INDEX
Page
Brake Lines And Hoses
.
13
Combination Valve Operation
13
Combination Valve Removal/Installation
.
13
Combination Valve Testing . . . . . . . . . . . . . . . . . .
13
General Information
. . . . . . . . . . . . .
10
GENERAL INFORMATION
Two master cylinders are used o n A D t r u c k mod-
els. A two-section master cylinder w i t h a removable
reservoir is used on D a n d W 100/150 models (Fig. 1).
A n i n t e g r a l (one-piece) master cylinder w i t h b u i l t - i n
fluid
reservoirs is used on D a n d W 250/350 models
(Fig. 2).
Two-Section Master Cylinder
The two-section master cylinder consists o f the cyl-
inder body and a removable fluid reservoir. The p r i -
m a r y
and secondary
pistons are located
i n t h e
a l u m i n u m body section. The removable reservoir is
made of n y l o n reinforced w i t h glass fiber a n d i s t h e
only serviceable component.
The fluid compartments of the n y l o n reservoir are
interconnected to p e r m i t
fluid
level
equalization.
However, t h e equalization feature does not affect cir-
cuit separation i n t h e event o f a front/rear brake
malfunction. The reservoir
compartments are de-
signed t o r e t a i n t h e necessary
q u a n t i t y o f
fluid
needed to operate t h e f u n c t i o n i n g c i r c u i t .
Care m u s t be excercised w h e n removing/installing
the master cylinder connecting lines. T h e threads i n
the fluid ports can be damaged i f care i s n o t prac-
ticed. S t a r t a l l brake l i n e f i t t i n g s b y h a n d t o avoid
cross threading.
T h e a l u m i n u m b o d y s e c t i o n o f t h e m a s t e r c y l -
i n d e r i s n o t a r e p a i r a b l e c o m p o n e n t . I f d i a g n o s i s
i n d i c a t e s t h a t a n i n t e r n a l m a l f u n c t i o n h a s oc-
c u r r e d , t h e a l u m i n u m b o d y s e c t i o n m u s t b e r e -
p l a c e d as a n a s s e m b l y .
Integral Master Cylinder
The cast, one-piece master cylinder is a v e n t i n g
type w i t h i n t e g r a l fluid reservoirs. T h e p r i m a r y and
secondary piston assemblies are located i n t h e cylin-
der bore. The cylinder i s a f u l l y serviceable compo-
nent and can be overhauled w h e n necessary.
Page
Master Cylinder Bleeding
12
Master Cylinder Installation
12
Master Cylinder Overhaul—Integral Cylinder . . . . . 11
Master Cylinder Removal
11
Master Cylinder Service—Two-Section Cylinder
. . 11
Fig. 1 Two-Section Master Cylinder
CLAMP
COVER
OUTLETS
MASTER CYLINDER BODY
RF494
Fig. 2 Integral Master Cylinder
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