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5 - 46
BRAKES
•
(4) Remove cylinder a t t a c h i n g bolts and remove
cylinder from support plate.
WHEEL CYLINDER OVERHAUL
WHEEL CYLINDER
DISASSEMBLY
(1) Remove the p u s h rods and boots (Fig. 10).
(2) Press the pistons, cups a n d s p r i n g a n d expander
out of the cylinder bore.
(3) Remove the bleed screw.
Fig. 10 Wheel Cylinder Components
CLEANING
AND
INSPECTION
Clean the cylinder and pistons w i t h fresh brake
fluid
or brake cleaner only. Do not use any other
cleaning agents. D r y the cylinder and pistons w i t h
compressed air. Do not use rags or shop towels to dry
the cylinder components. L i n t f r o m such materials
can adhere to the cylinder bores and pistons.
Inspect the cylinder bore. L i g h t discoloration and
d a r k stains i n the bore are n o r m a l and w i l l not i m -
pair cylinder operation. I f desired, the bore can be
l i g h t l y polished b u t only w i t h crocus cloth. Replace
the cylinder i f t h e bore i s scored, p i t t e d or h e a v i l y
corroded. H o n i n g t h e bore t o restore the surface i s
not recommended.
Inspect t h e cylinder pistons. The piston surfaces
should be smooth a n d free o f scratches, scoring a n d
corrosion. Replace t h e pistons i f w o r n , scored, or cor-
roded. Do a t t e m p t t o restore t h e surface by sanding
or polishing.
Discard t h e old p i s t o n cups a n d the spring and ex-
pander. These p a r t s are not reusable. The o r i g i n a l
dust boots m a y be reused b u t o n l y i f they are i n good
condition.
ASSEMBLING
WHEEL
CYLINDER
(1) L u b r i c a t e wheel cylinder bore, pistons, piston
cups a n d s p r i n g a n d expander w i t h clean brake f l u i d .
(2) I n s t a l l f i r s t p i s t o n i n cylinder bore. Then i n s t a l l
cup i n bore a n d against piston. B e s u r e l i p o f p i s -
t o n c u p i s f a c i n g i n w a r d ( t o w a r d s p r i n g a n d ex-
p a n d e r ) a n d f l a t s i d e i s a g a i n s t p i s t o n .
(3) I n s t a l l s p r i n g a n d expanders followed b y r e -
m a i n i n g piston cup a n d piston.
(4) I n s t a l l boots on each end of cylinder and insert
push rods i n boots.
(5) I n s t a l l cylinder bleed screw.
WHEEL CYLINDER INSTALLATION
(1) A p p l y bead o f silicone sealer around cylinder
m o u n t i n g surface o f support plate.
(2) Connect b r a k e l i n e t o cylinder. M o u n t cylinder
on support plate a n d i n s t a l l cylinder a t t a c h i n g bolts.
(3) I n s t a l l wheel brake components.
(4) I n s t a l l b r a k e d r u m and wheel and bleed brakes.
12-INCH DRUM B R A K E
INDEX
Page
Brake Drum Installation
50
Brake Drum Removal
.
48
Brake Drum Service
50
Brake Shoe Installation
49
Brake Shoe Removal
.
48
Brake Support Plate Installation
. 51
Brake Support Plate Removal
51
GENERAL INFORMATION
Twelve inch rear d r u m brakes are used on D and
W 250/350 models (Fig. 1). A l l applications are d u a l
shoe, i n t e r n a l expanding u n i t s w i t h a self adjusting
Page
Cleaning And Inspection
49
General Information
46
Safety Precautions
48
Wheel Cylinder Installation
51
Wheel Cylinder Overhaul
51
Wheel Cylinder Removal
51
mechanism. A single wheel cylinder is used t o ex-
pand t h e d u a l brakeshoes. The lower ends o f the
brake shoes are connected b y a star wheel-type ad-
juster screw w h i c h is p a r t of t h e self adjusting mech-
anism (Fig. 1).
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