Condition
Excessive
pedal
travel
Spongy
pedal
Poor
braking
effect
Brakes
drag
Brake
Syst
em
TROUBLE
DIAGNOSES
AND
CORRECTIONS
Probable
cause
Low
brake
1uid
level
or
empty
master
cylinder
reservoir
Leakage
in
master
cylinder
Deteriorated
check
valve
Air
in
system
Faulty
brake
adjustment
Low
1uid
level
in
master
cylinder
Air
in
system
Faulty
brake
adjustment
Reservoir
filler
cap
vent
hole
clogged
Swollen
hose
due
to
deterioration
or
use
of
poor
quality
hose
Distorted
brake
shoes
or
excessively
worn
or
cracked
brake
drum
Soft
or
swollen
caliper
seals
Use
of
a
brake
1uid
with
too
low
boiling
point
Fluid
leakage
in
brake
lines
Low
brake
1uid
level
or
empty
master
cylinder
reservoir
Air
in
brake
lines
Excessive
shoe
ta
drum
clearance
Grease
oil
mud
or
water
on
linings
or
pads
Deterioration
of
linings
or
pads
Local
fit
of
linings
or
pads
Linings
or
pads
excessively
worn
Master
cylinder
or
wheel
cylinders
in
poor
condition
Binding
mechanical
linkage
at
brake
pedal
and
shoes
Clogged
brake
lines
Incorrect
adjustment
of
wheel
bearings
Improper
shoe
t
drum
clearance
Weak
shoe
return
springs
No
free
travel
in
brake
shoe
return
BR
22
Corrective
action
Fill
and
bleed
as
necessary
Test
for
source
of
leakage
by
examining
all
lines
connec
tions
and
wheel
cylinder
Overhaul
master
cylinder
Replace
check
valve
and
bleed
system
Bleed
system
Adjust
shoe
to
drum
clearance
Inspect
auto
adjuster
operation
Top
with
1uid
and
inspect
for
leakage
Correct
as
necessary
Adjust
shoe
to
drum
clearance
Inspect
aut
adjuster
operation
Clean
and
bleed
system
Replace
hose
and
bleed
system
Replace
faulty
parts
Drain
hydraulic
system
flush
with
alcohol
and
replace
all
seals
Replace
with
specified
brake
1uid
and
bleed
system
Check
master
cylinder
pIpIng
and
wheel
cylinder
for
leaks
and
repair
Fill
and
bleed
as
necessary
Bleed
system
Adjust
Clean
brake
mechanism
and
check
for
cause
of
problem
Replace
linings
or
pads
Replace
Shave
or
replace
Replace
Repair
or
replace
Free
up
as
required
Check
and
clean
Adjust
or
repair
Adjust
Replace
Adjust
pedal
height
Condition
Brake
chatters
Brake
squeals
Pedal
pulsates
Brakes
fade
Brakes
drag
Unbalanced
brakes
Brake
System
Probable
cause
Groove
or
out
of
round
brake
drum
Loose
or
bent
brake
disc
Distorted
brake
shoes
or
pads
Grease
or
brake
fluid
on
linings
Dirty
or
scored
brake
drums
Distorted
brake
shoes
or
bent
support
plate
Weak
or
broken
brake
shoe
retaining
spring
or
return
spring
Glazed
or
contaminated
brake
lining
Out
of
round
or
off
center
drum
Brake
fluid
has
too
low
boiling
point
Use
of
improper
linings
or
brake
linings
are
contaminated
Brake
drums
are
out
of
round
Hydraulic
connections
master
cylinder
and
wheel
cylinders
are
corroded
or
damaged
Bleed
screw
is
open
Pedal
linkage
is
binding
or
push
rod
adjust
ment
is
too
long
Master
cylinder
compensator
part
is
ob
structed
Seized
master
cylinder
piston
Poor
shoe
condition
Poor
wheel
cylinder
condition
Deformation
of
piston
cups
Hand
brake
will
not
return
Clogged
master
cylinder
return
port
Improper
tire
inflation
Improper
adjustment
of
shoe
to
drum
clear
anee
Grease
oil
mud
or
water
on
linings
or
pads
Mud
in
brake
drum
Deterioration
of
linings
or
pads
Excessive
wear
of
linings
or
pads
BR
23
Corrective
action
Grind
or
replace
as
required
Tighten
support
plate
bolts
to
specified
torque
or
replace
plate
Replace
as
necessary
Replace
linings
Blowout
assembly
with
compressed
air
or
refinish
drum
Replace
faulty
unit
Replace
if
faulty
Cam
ground
lining
to
eliminate
glaze
If
it
doesn
t
replace
linings
Turn
drum
or
replace
as
necessary
Drain
and
fill
system
with
approved
fluid
Replace
linings
Repair
or
replace
as
necessary
Repair
as
necessary
Close
screw
and
bleed
system
Lubricate
linkage
check
pedal
return
spring
for
condition
and
adjust
push
rod
as
neces
sary
Blowout
foreign
matter
with
compressed
air
Disassemble
master
cylinder
and
replace
piston
Bleed
system
Clean
and
repair
Repair
or
replace
Replace
Check
and
repair
Clean
Inflate
to
correct
pressure
Readjust
Clean
brake
mechanism
and
check
for
cause
of
problem
Replace
linings
or
pads
Clean
Replace
Replace
