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PART 2-1-GENERAL BRAKE SERVICE
2-7
TABLE
1-(Continued)
DISC BRAKE TROUBLE SYMPTOMS AND POSSIBLE CAUSES
TROUBLE SYMPTOMS
POSSIBLE CAUSES
CORRECTION
HEAVY BRAKE DRAG
Stuck or seized
piston.
Free
up
or
replace
piston and
piston
seal.
Incomplete brake pedal
return.
·
Binding linkage-free up.
Improperly.
assembled
caliper as-
Loosen caliper slide
pins
and
re·
sembly.
torque
with brake
pedal
-applied
-
Girling
only.
Brake
booster
malfunction.
Replace
booster.
CALIPER BRAKE FLUID LEAK
Loose front brake hose
through
Replace missing
copper
gasket or
bolt or copper gasket
omitted.
tighten through
bolt to specification.
Loose bleeder screw.
Tighten
bleeder screw to specified
torque.
Caliper housing porosity.
Replace caliper housing.
Cut or rolled
piston
seal.
Replace piston
seal.
Foreign
substance in
caliper
piston
Clean
piston
seal groove and re-
seal
groove.
place seal.
Piston scored or
damaged.
Replace
piston and seal.
.
TABLE 2
DRUM BRAKE TROUBLE SYMPTOMS AND POSSIBLE CAUSES
TROUBLE SYMPTOMS
POSSIBLE CAUSES
ONE BRAKE DRAGS
Brake line
restricted.
Drum out of round.
Faulty retracting spring.
Faulty
brake
cylinder.
Loose carrier
plate.
Dirty
brake
fluid.
Air in
hydraulic system.
Insufficient shoe-to-carrier
plate
Distorted
or
improperly adjusted
lubrication.
brake shoe.
ALL
BRAKES.
DRAG
.Mechanical resistance
at pedal or
Brake
line
restricted
.
shoe.
Distorted
or improperly
adjusted
Dirty
brake fluid.
brake shoe.
Faulty
master
cylinder.
HARD PEDAL
Mechanical resistance at
pedal or
Brake line
restricted.
~
shoes.
Distorted
or improperly
adjusted
Lining glazed or
worn.
brake
shoe.
SPONGY PEDAL
Leaks or
insufficient
fluid.
Air in
hydraulic
system.
CAR PULLS TO ONE SIDE
Brake line
restricted.
Improper
tyre
pressure.
Distorted
or
improperly adjusted
Faulty retracting
spring.
brake shoe.
Drum out of round.
Lining glazed
or worn.
Oil or grease
on lining.
Faulty
brake cylinder.
Self
adjusters
not
operating.
ONE WHEEL LOCKS
Distorted or improperly adjusted
Oil
or
grease
on lining.
brake shoe.
Faulty
brake
cylinder.
Loose carrier plate.
Tyre tread worn.
Lining glazed
or worn.
BRAKES CHATTER
Drum out of round.
Loose carrier plate.
Oil
or grease on
lining.
Loose lining.
Poor
lining to
drum contact.
Loose front suspension.
Lining glazed
or worn.
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