Dodge RAM TRUCK 1500 1995 Service Manual page 241

B R
DRUM BRAKES 5 - 69
SECONDARY
SHOE
RETURN
SPRING
SECONDARY
BRAKESHOE
ADJUSTER
LEVER
SPRING
SUPPORT
PLATE
WHEEL
CYLINDER
SPRING
RETAINER
RETAINER
SPRING
HOLDDOWN
SPRING,
PIN,
RETAINERS
ANCHOR
PIN
SHOE
GUIDE
PLATE
PARK
BRAKE
STRUT
AND
SPRING
. ADJUSTER
LEVER
LEVER
SPRING
ADJUSTER
SCREW
ASSEMBLY
Fig. 11 Brakeshoe Component
WHEEL CYLINDER REMOVAL (ALL)
(1) Lift adjuster lever away from adjuster screw.
Then turn screw star wheel until screw is fully re­
tracted.
(2) Remove brakeshoe return springs, adjuster
spring and adjuster screw. Move upper ends of brake-
shoes apart to provide removal clearance for wheel
cylinder links.
(3) If brakeline and fitting are rusty, or corroded,
apply liberal quantity of Mopar rust penetrant to line
and fitting. This will break corrosion and avoid dam­
aging brakeline during removal.
(4) Disconnect brakeline from wheel cylinder.
(5) Remove wheel cylinder attaching screws and
remove cylinder from support plate
WHEEL CYLINDER OWERHAUL (ALL)
Wheel Cylinder Disassembly
(1) Pull links out of cylinder boots.
(2) Remove piston boots. Use plastic or wood tool
to either pry boots out or pull them out with needle-
nose pliers.
(3) Push pistons, cups and expander spring out one
end of cylinder bore (Fig. 12).
(4) Discard boots, piston cups and expander spring.
They are not reusable parts.
(5) Remove bleed screw from cylinder.
PRIMARY
BRAKESHOE
PRIMARY
SHOE
RETURN
SPRING
PARK
BRAKE
STRUT
SHOE
SPRING
HOLDDOWN
SPRING, PIN,
RETAINERS "
J9405-19
installation (13 Inch Brake)
Wheel Cylinder Cleaning And Inspection
Clean the cylinder, pistons and links with Mopar
brake cleaner. Clean the wheel cylinder and support
plate mounting surfaces with a wire brush to ensure
proper seating at installation.
Inspect the cylinder bore. The bore should be
smooth and free of scoring, corrosion, or pitting.
Light discoloration of the bore is a normal condition
and does indicate replacement is necessary. Very
slight scratches, or nicks can be polished out by hand
with crocus cloth.
The cylinder bore can be cleaned out with a fiber
bristle brush if necessary. However, DO NOT hone
the cylinder bore. Replace the wheel cylinder
as an assembly if the bore surface is corroded,
pitted or scored.
_ Check condition of the cylinder brakeline and bleed
screw threads. Replace the wheel cylinder if the
threads are damaged in any way. replace the bleed
screw if the screw threads are damaged, or the screw
is corroded, or distorted.
Inspect the wheel cylinder pistons. Replace the pis­
tons if worn, scored, corroded, or pitted. Do not sand
the pistons in an attempt to restore the surface and
reuse them. In most cases, if the pistons are dam­
aged, the cylinder bore will also be damaged requir­
ing complete replacement.