Dodge ram truck 3500 1996 Service Manual page 225

B R BRAKES 5 - 41
DISASSEMBLY AND ASSEMBLY
(Continued)
Fig. 88 Seating Dust Boot
(13) Lubricate caliper mounting bolts, collars,
bushings and bores with Dow 111, or GE 661 silicone
grease.
(14) Install bushings, seals, boots and mounting
bolts In caliper (Figs. 23 and 24).
(15) Install caliper bleed screw.
WHEEL CYL11DER
DISASSEMBLY
(1) Remove push rods and boots (Fig. 89).
(2) Press pistons, cups and spring and expander
out of cylinder bore.
(3) Remove bleed screw.
Fig. 89 Wheel Cylinder Components
ASSEMBLY
(1) Lubricate wheel cylinder bore, pistons, piston
cups and spring and expander with clean brake fluid.
(2) Install first piston in cylinder bore. Then
Install first cup i n bore and against piston. Be sure
l i p of piston cup is facing i n w a r d (toward
spring and expander) and flat side is against
piston.
(3) Install spring and expander followed by
remaining piston cup and piston.
(4) Install boots on each end of cylinder and insert
push rods in boots.
(5) Install cylinder bleed screw.
C L E A N I N G A N D I N S P E C T I O N
REAR DRUM BRAKE
CLEANING
Clean the individual brake components, including
the support plate and wheel cylinder exterior, with a
water dampened cloth or with Mopar brake cleaner.
Do not use any other cleaning agents. Remove light
rust and scale from the brakeshoe contact pads on
the support plate with fine sandpaper.
INSPECTION
As a general rule, riveted brakeshoes should be
replaced when worn to within 0.78 mm (1/32 in.) of
the rivet heads. Bonded lining should be replaced
when worn to a thickness of 1.6 mm (1/16 in.).
Examine the lining contact pattern to determine i f
the shoes are bent or the drum is tapered. The lining
should exhibit contact across its entire width. Shoes
exhibiting contact only on one side should be
replaced and the drum checked for runout or taper.
Inspect the adjuster screw assembly. Replace the
assembly If the star wheel threads are damaged, or
the components are severely rusted or corroded.
Discard the brake springs and retainer components
if worn distorted, or collapsed. Also replace the
springs i f a brake drag condition had occurred. Over­
heating will distort and weaken the springs.
Inspect the brakeshoe contact pads on the support
plate, replace the support plate If any of the pads are
worn or rusted through. Also replace the plate i f it.is
bent or distorted (Fig. 90).
CALIPER
CLEANING
Clean the caliper components with clean brake
fluid or Mopar brake cleaning solvent only. Do not
use gasoline, kerosene, thinner, or similar solvents.
These products may leave a residue that could dam­
age the piston and seal.
Wipe the caliper and piston dry with lint free tow­
els or use low pressure compressed air.
INSPECTION
The piston Is made from a phenolic resin (plastic
material) and should be smooth and clean.