Chevrolet 1980 Light Duty Truck Service Manual page 361

C O N D IT IO N
B ra k e ro u g h n e s s o r c h a tt e r
(P e d a l P u ls a te s ) — C o n tin u e d
Excessive P e d a l E ffo rt
Excessive P e d a l T ra v e l
D r a g g in g B ra kes
(A v e ry lig h t d r a g is
p re s e n t in a l l disc
b r a k e s im m e d ia t e ly a f t e r
p e d a l is r e le a s e d .)
PO S S IB L E C A U S E
5 . S h o e re v e rs e d (s te e l
a g a in s t iro n ).
1. M a lfu n c tio n in g p o w e r
b r a k e .
2 . P a r tia l system f a i l u r e .
3 . E xcessively w o rn shoe
a n d lin in g .
4 . Piston in c a lip e r stuck
o r s lu g g is h .
5 . F a d in g b r a k e s d u e to
in c o rre c t lin in g .
1. P a r tia l b r a k e system
f a i l u r e .
2 . In s u ffic ie n t f lu id in
m a s te r c y lin d e r .
3 . A ir t r a p p e d in system .
4 . R e a r b r a k e n o t a d ju s tin g .
5 . B e n t sh oe a n d lin in g .
1. M a s te r c y lin d e r pistons
n o t r e tu r n in g
c o rre c tly .
2 . R e s tric te d b r a k e p ip e s
o r hoses.
C O R R E C T IO N
5 . R e p la c e shoe a n d lin in g a n d
m a c h in e ro to r w ith in
s p e c ific a tio n s .
1. C h e c k p o w e r b r a k e a n d r e p a ir
if n e ce s s a ry .
2 . C h e c k fr o n t a n d r e a r b r a k e
system a n d r e p a i r , if
n e c e s s a ry . A ls o , c h e c k
a n d r e p a ir b r a k e w a r n in g
lig h t c irc u it if a f a i l e d
system is fo u n d a n d lig h t
d id n o t fu n c tio n .
3 . C h e c k a n d r e p la c e in a x le
sets.
4 . R em ove c a lip e r a n d r e b u ild .
5 . R em ove a n d r e p la c e w ith
o r ig in a l e q u ip m e n t lin in g
(o r e q u iv a le n t ) .
1. C h e c k b o th fr o n t a n d r e a r
system f o r a f a i l u r e a n d
r e p a ir . A ls o ch eck a n d
r e p a ir w a r n in g lig h t c irc u it.
It s h o u ld h a v e in d ic a te d
a f a i l u r e .
2 . F ill reservo irs w ith
a p p r o v e d b r a k e f lu id . C h e c k
fo r le a k s . C h e c k w a r n in g
lig h t.
3 . B le e d system .
4 . A d ju s t r e a r b ra k e s a n d
r e p a ir a u to a d ju s te rs .
5 . R e p la c e a x le set o f sh oe
a n d lin in g .
1. W it h re s e rv o ir co ver o f f ,
c h eck fo r f lu id s p u rt
a t b y p a s s h o les as p e d a l
is d e p r e s s e d . A d ju s t push
r o d , if n e ce s s a ry , o r
r e b u ild m a s te r c y lin d e r .
2 . C h e c k f o r so ft hoses o r
d a m a g e d p ip e s a n d r e p la c e
w ith n e w hoses a n d n e w
d o u b le - w a lle d s te e l
b r a k e t u b in g .
BRAKES 5-7
L IG H T T R U C K S ER V ICE M ANUAL