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5 -5 4 BRAKES
Probable Cause
1. Maladjustment.
2. Parking brake cables frozen .
Probable Cause
1.
Grease or f l u i d soaked l i n i n g .
2.
Adjustment not c o r r e c t .
3.
Loose wheel bearings, loose fla n g e p la te on rear
axle or f r o n t axle or loose sp ring b o lt 6 .
4.
Linings not o f s p e c ifie d kind or primary and
secondary shoes reversed.
5.
T ires not p ro pe rly i n f l a t e d or unequal wear o f
tread .
D i f f e r e n t tread non-skid design.
6.
Linin gs charred.
7.
Water, mud, e t c . , in brakes.
8.
Wheel c y li n d e r s t i c k i n g .
9.
Weak or broken r e t r a c t i n g s pring s.
10.
Out-of-round drums.
11.
Brake dragging.
12.
Weak chassis springs or loose "U" b o lt s .
13.
Loose s t e e rin g .
14.
Unequal camber.
15.
Clogged or crimped h y d r a u lic l i n e .
16.
Wheel c y li n d e r s ize d i f f e r e n t on opposite sid es.
17.
Loose king pin or bushings.
18.
Bad drum.
DIAGNOSIS—DRUM BRAKES
REAR BRAKES DRAG
1. Adjust brake shoes and parking brake mechanism.
2. Lu bricate w ith Delco Brake Lube #5450032 (or
e q u i v a le n t ) .
V E H IC LE P U LLS TO ONE SID E
1.
Replace w ith new l i n i n g s .
Adjust the brakes.
2.
3 .
A djus t the wheel bearing, tig h t e n the fla nge
p la t e on the re a r and f r o n t axles and t ig h t e n
spring b o lt s .
4.
I n s t a l l new 1in in g s .
5.
I n f l a t e the t i r e s to recommended pressures.
Rearrange the t i r e s so t h a t a p a ir o f non-
skid tread surfaces o f s i m i l a r design
and equal wear w i l l be i n s t a l l e d on the f r o n t
wheels, and another p a ir w ith l i k e tread w i l l
be i n s t a l l e d on the rea r wheels.
6.
Replace w ith new l i n i n g .
Remove any f o r e ig n m aterial from a l l o f the
7 .
brake parts and the in s id e o f the drums.
L u bricate the shoe ledges and the re a r brake
cable ramps w ith Delco Brake Lube
(o r e q u i v a l e n t ) .
8.
Overhaul or repla ce wheel c y l i n d e r .
9.
Check s p r in g s -re p la c e bent, open-coiled or
cracked s pring s.
Resurface or replace drums in l e f t and r i g h t
10.
hand p a irs (both f r o n t and both r e a r ) .
11.
Check f o r loose l i n i n g .
Replace springs or t ig h t e n
12.
Repair and a d ju s t.
13.
14.
A djus t to s p e c if ic a t i o n s .
15.
Repair or replace l i n e .
16.
Replace w ith c o r r e c t c y li n d e r s .
Replace king pins or bushings.
17.
18.
R e finis h drums in p a ir s .
Remedy
Remedy
#5450032
A d ju st.
b o l t s .
"U"
LIGHT DUTY TRUCK SERVICE MANUAL
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