Toyota Hilux Surf 1993 Owner's Manual page 667

BR–4
Problem
Squeaking, squealing
groaning or
chattering noise
when brakes are
applied
HINT: Brake friction
materials inherently
generate noise and
heat in order to
dissipate energy. As
a result, occasional
squeal is normal and
is aggravated by
severe environmental
conditions such as
cold, heat, wetness,
snow, salt, mud, etc.
This occasional
squeal is not a
functional problem
and does not indicate
any loss of brake
effectiveness
Squealing and
squeaking noise
when brakes are not
applied
BRAKE SYSTEM
TROUBLESHOOTING (Cont'd)
Possible cause
Brake drums and linings, rotors and pads
worn or scored
Dirty, greased, contaminated or glazed
linings or pads
Improper linings or pads using
MaIadjustment of brake pedal or booster
push rod
(Disc brake)
Missing or damaged brake pad anti–squeal
shim
Pad wear and pad wear indicator making
contact with the rotor
Burred or rusted calipers
(Drum brake)
Weak damaged or incorrect shoe hold–
down springs, loose or damaged shoe
hold–down spring pins and springs and
grooved backing plate ledges
MaI–adjustment of brake pedal or booster
push rod
Poor return of brake booster or master
cylinder or brake cylinder
(Disc brake)
Rusted or stuck piston
Improper positioning of pad in caliper
Rotor rubbing against caliper housing
Improper installation of disc brake pad
support plate
Pad wear and pad wear indicator making
contact with the rotor
(Drum brake)
Weak, damaged or incorrect shoe hold–
down springs
Grooved backing plate ledges
Bent or warped backing plate causing
interference with drum
Improper machining of drum causing
interference with backing plate or shoe
Other brake system components:
Loose or extra parts in brakes
Rear drum adjustment too tight
causing lining to glaze
Worn, damaged or insufficiently
lubricated wheel bearings
– Troubleshooting
Remedy
Inspect, repair or replace
Clean or replace
Inspect for correct usage or
replace
Inspect and adjust
Replace
Replace
Clean or deburr
Inspect, repair or replace
Inspect and adjust
Inspect, repair or replace
Inspect and lubricate as
necessary
Reinstall correctly
Inspect and replace
Reinstall correctly
Replace
Replace
Repair or replace
Repair or replace
Replace drum
Inspect, repair or replace as
necessary
Page
BR–18, 26
33,40
47, 55
BR–18, 26
33,40
47, 55
BR–6,
17
BR–1
8, 26
33
BR–18, 26
33
BR–18, 26
33
BR–40, 47
55
BR–6, 17
BR–10, 16
18,26
33,40
47, 55
BR–18, 26
33
BR–18, 2
33
BR–18, 26
33
BR–40, 47
55
BR–40, 47
55
BR–40, 47
55
BR–40, 47
55
BR–40, 47
55