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BRAKES
5-37
Fig.
5-56
Typical Drum Brake Assembly
10. If any hydraulic connections were disturbed, bleed
hydraulic system.
1 1. Adjust parking brake.
12. Inspect all brake pipes, hoses and connections for
evidence of fluid leakage. Tighten any leaking connection.
Then apply heavy pedal pressure to brake pedal and recheck
connections.
13. Check fluid level in master cylinder and add fluid
if necessary.
14. Check brake pedal for proper feel and for proper
return.
15. Remove jacks and road test car for proper brake
action. Brakes must not be severely applied immediately after
installation of new brake shoes or linings. Severe application
may permanently damage new linings and may score brake
drums. When linings are new, they must be given moderate
use for several hundred miles of burnishing.
Repair Brake Lining
This procedure is to be used when brake action is
unequal, severe, hard, noisy or otherwise unsatisfactory and
when brake linings have had little wear.
1. Check fluid in master cylinder and add fluid if
necessary.
2. Check brake pedal for proper feel and for proper
return.
3. Jack up car in a safe manner and remove all wheels.
4. Remove all brake drums. Brake pedal must not be
operated while drums are removed.
See Warning page 5- 1.
5. Clean all dirt out of brake drums, using care to avoid
getting dirt into front wheel bearings. Inspect drums and
replace or recondition if required.
6. Clean all dirt from brake assemblies, then inspect
brake linings for uneven wear, oil soaking, loose rivets or
imbedded foreign particles. If linings are oil soaked,
replacement is required.
7. If linings are otherwise serviceable, tighten or replace
loose rivets and thoroughly clean all steel or other imbedded
particles from surfaces and rivet counterbores of linings.
8. Check all backing plate bolts to make sure they are
tight.
9. Measure brake drum I.D. using inside caliper portion
of Tool J 21 177. Adjust brake shoes to dimension obtained,
on outside caliper portion of Tool J 21 177. See Figures 5-57
and 5-58.
Fig.
5-57
Measuring Brake Drum I.D.
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-
-
-
Fig. 5-58 Adjusting Brake Shoes
10. Install drum and wheel and tire assemblies.
11. Remove jacks and road test car for proper brake
action. Brakes must not be severely applied immediately after
installation of reground brake shoes or linings. Severe
application may permanently damage new linings and may
score brake drums. When linings are new, they must be given
moderate use for several hundred miles of burnishing.
INSPECTION AND RECONDITIONING
BRAKE DRUMS
Whenever brake drums are removed, they should be
thoroughly cleaned and inspected for cracks, scores, deep
grooves and out-of-round.
Cracked, Scored, or Grooved Drum
A cracked drum is unsafe for further service and must
be replaced. Do not attempt to weld a cracked drum.
Smooth up any slight scores. Heavy or extensive scoring
will cause excessive brake lining wear, and it will probably
be necessary to rebore in order to true up the braking surface.
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