Chevrolet 1977 light duty truck, Service Manual

Page: 426 / 861

Fig. 5-49- Removing Hold Down Pins Using J 22348
they are broken. It is m uch easier to assemble and
disassemble the brakes leaving them intact,
o -T-i j , j • •
n ,
i Fig. 5-50- Brake Shoe and Self A djuster Assem bly
8. I h r e a d the adjusting screw out o f the anchor
support and remove and discard the friction spring.
9. C lean all dirt out o f brake drum. Inspect drum s
for roughness, scoring or out-of-round. Replace or
recondition drum s as necessary.
N O T E : See Section on "B R A K E D R U M S " .
10. Carefully pull lower edges o f wheel cylinder
boots away from cylinders. If brake fluid flows out,
overhaul o f the wheel cylinders is necessary.
N O T E : A slight a m o u n t o f fluid is nearly always
present and acts as a lubricant for the piston.
11. Inspect flange plate for oil leakage past axle
sh a ft oil seals. Install seals if necessary.
12. Check all flange p late attaching bolts to make
sure they are tight (150 ft. lbs. torque). Clean all dirt and
rust from shoe contact faces on flange plate using em ery
cloth.
13. T horo u g h ly clean adjusting screws and threads
in the a nchor brackets.
Installation
1. Put a light film o f Delco Brake Lube (or
equivalent) on shoe bearing surfaces o f brake flange
plate and on th read s o f adjusting screw.
2. T h re a d adjusting screw completely into anchor
bracket w ithout friction spring to be sure threads are
clean and screw turns easily. T hen remove screw,
position a new friction spring on screw and reinstall in
anch o r bracket.
CAUTION: See "C a u tio n " on Page I o f this
section.
Fig. 5-5 1 -M e a su rin g Points for Shoe C entering
3. Assemble self adjuster assembly to brake shoe
and position actuating lever link on override lever.
4. Position hold down pins in flange plate.
5. Install brake shoe and self adjuster assemblies
onto hold down pins, indexing ends o f shoes with wheel
cylinder push rods and legs o f friction springs.
NOTE: M ake sure the toe o f the shoe is against the
adjusting screw (fig.5-50).
6. Install cup, spring and retain er on end o f hold