Page 633 of 796

08-6
4. TROUBLESHOOTING
Problem Possible Cause Action
Noise or vehicle
vibration when
appliedIncorrectly mounted back plate or caliper Repair
Loosened bolt of back plate or caliper Retighten
Uneven wear of brake disc Replace
Brake pad contamination Clean or replace
Sticking brake pad on contact surface Replace
Wear or hardening of brake pad Replace
Excessive clearance between caliper and pad Repair
Uneven contact of pad Repair
Lack of lubrication in sliding parts Lubricate
Improper operation of caliper Replace
Dust cover missing Repair
Loosened suspension mounting bolt Retighten
Pulls to one side
when brakingUnbalanced tire pressure between left and right Adjust
Poor contact of brake pad Repair
Oil or grease on brake pad Replace
Scratch, uneven wear, distortion of brake disc Replace
Improperly installed brake caliper Repair
Improper operation of auto adjuster Repair
Crack or distortion of brake pad Replace
Poor braking Oil leak or contamination Repair or replace
Air in brake line Bleed air
Improper operation of brake booster Repair
Poor contact of brake pad Repair
Oil or grease on brake pad Replace
Improper operation of auto adjuster Repair
Clogged brake line Repair
Improper operation of proportioning valve Repair
Page 651 of 796

09-54891-01
2. FUNCTION
1) Term Definition
ABS: Anti-Lock Brake System ▶
When the brake pedal is abruptly depressed, the HECU calculates the slip ratio of each wheel based
on information received from the wheel speed sensors and controls the hydraulic module data quickly
and precisely in order to maintain the friction between the road surface and tire optimal (static friction).
Therefore, by keeping the friction between the road surface and tire optimal, it is possible to obtain
following effects: Enhanced steering stability, improved direction stability, reduced stopping distance
and etc.
EBD: Electronic brake-Force Distribution ▶
This is to detect the tire speed from the wheel speed sensor in order to supply the braking pressure to
the rear tires individually. In other words, the HECU measures the tire deceleration speed continuously
and controls the rear inlet valve on the hydraulic modulator to obtain optimal braking force as much as
possible. Thereby, stopping distance, braking effect and straight stability are improved.
ESP: Electronic Stability Program ▶
This is used to make the vehicle stabilized to recognize the emergency driving conditions, and to
control the brake for each wheels and the engine power when the brake system or acceleration will not
work any more in dangerous circumstances.
TCS: Traction Control System ▶
When the wheel is slipping due to an excessive engine torque while starting off or driving, this controls
the driving force (braking force + engine torque) in order to prevent the wheel from slipping through the
engine or brake control.
AYC: Active Yaw Control ▶
This has been developed to help a driver avoid danger of losing control of the vehicle stability due to
understeer or oversteer during cornering, which is a part of the ESP function.
HBA: Hydraulic Brake Assistant ▶
Developed based on the fact that elderly drivers depress the brake pedal too soft even when hard
braking is necessary, this an assist system to operate the HECU drive motor immediately and apply
high braking force to the wheels when the brake pedal is depressed softly and the vehicle should be
braked in emergency.
ARP: Active Rollover Protection ▶
This is a supplementary device for safety in ESP system and can help minimize the rollover accidents
by detecting a potential rollover situation through the brake and engine control when making sudden
lane change or turning sharply by adding only the software, without any separate device or switch.
Page 698 of 796
12-34170-01
1. SPECIFICATION
Description Specification
Tire 16 inch 225/65R16
17 inch 235/60R17
Tire inflation pressure 35 psi
Wheel 16 inch 6.5JX16
17 inch 7.0JX17
Balance weight Inner: Clip-on type
Outer: Tape type
Tightening torques of wheel bolt 127.4 to 156.8 Nm
Wheel offset 2WD 38 mm
4WD 50 mm
Page 700 of 796

12-54170-01
1. OVERVIEW
A radial tire uses a cord angle of 90 degrees. That is, the cord material runs in a radial or direct line
from one bead to the other across the tread. In addition, a radial tire has a belt overwrap under the
tread surface to provide greater structural stability. The belt overwrap of a radial tire distortion while the
radial structure enables high speed driving.
Tire supports the weight of the vehicle, reduces the impact from the road and at the same time,
transmits the power to propel, brake and steer on the road. It also functions to maintain a
vehicle’s movement. In order to complete such tasks, a tire must be structured to be a resilient
vessel of air.
There is wear limit mark on the tire, which protrudes as a strip shape located approximately 1.6 mm
from the groove bottom. This wear limit mark is not seen from the outside so there is additional
"▲" mark on the shoulder to let the driver find the wear mark easily. To measure the tire groove
depth, measure at any point other than the point which has a wear limit mark.
The tire is worn unevenly according to the driver's driving habit, improper servicing, low tire inflation
pressure, changed tire location, etc.
1) Structure of Tire
Tread
This thick layer of rubber provides the interface
between the tire and the road. Wear-resistant
rubber is used to protect the carcass and belt
against fractures and impacts and to deliver a
long driving life.
Shoulder
Located between the tread and sidewall, the
shoulder rubber is the thickest so that the
design must allow for the easy diffusion of heat
generated within the tire while driving.
Sidewall
The part between the shoulder and bead, the
flexible sidewall protects the carcass and
enhances the ride. A tire’s type, size,
structure, pattern, manufacturing company,
product name and various characters are
indicated here. Bead
The bead attaches the tire to the rim and wraps
the end of the cord fabric. Comprised of the bead
wire, core, flipper and other parts, the bead is
generally designed to be slightly tight around the
rim so that in the case of a sudden drop in
inflation pressure, the tire will not fall off the rim.
Carcass
As the most important framework of a tire, the
entire inner layer of cord fabric is called the
carcass. The carcass acts to support air
pressure, vertical load and absorb shocks.
Valve
Belt
Bead core
Page 701 of 796
12-6
2) Tire Unit Indication
Aspect ratio (%)
= Nominal section height (H) / Nominal section
width (W)
X 100
3) Tire Inflation Pressure (35 psi)
Proper inflation pressure Excessive inflation pressure Low inflation pressure
The contact area between the
ground and tire faces the tread
layer completely. Thus the driving
force and the braking force are
optimized, and the tire is worn out
evenly resulting in increased life.The contact area between the
ground and tire is not enough,
so the tire is worn out unevenly
and the tire is vulnerability to
outside influence.The contact area between the
ground and tire is excessive, so
a lot of heat is generated and
the tire is worn out unevenly
and abnormally.
Tread widthTread widthTread width
Page 702 of 796

12-74170-01
During driving, the rotating tire repeats deformation and restoring movement in is tread. This happens
when the tire pressure is low in high speed driving.
However, when the wheel rotating speed is fast, the tire is deformed even before it is restored to its
original shape and the trembling wave appears on the tread portion. If this symptom lasts for an
extended period of time, the tire can be blown out in a short period of time.
If the standing wave symptom occurs on the tire, rubber on the tread comes off and eventually the tire
can be blown out which is very dangerous. When driving at high speed, the inflation pressure should
be increased to decrease heat generation due to extension and contraction motion, to decrease
hydroplaning and to prevent standing wave.
To prevent this symptom, it is recommended to increase the tire pressure 10 ~ 30 % higher than the
specified pressure value in high speed driving.
Specified tire inflation pressure35 psi
2. ABNORMAL TIRE SYMPTOM
1) Standing Wave
Page 703 of 796
12-8
When the vehicle is driven on a road surface covered with water at high speed, tires do not contact
with the road surface but rotate floating on a thin film of water.
It causes brake failure, lower traction force and losing the steering performance.
To prevent this, increase the tire inflation pressure, use tires with leaf shape tread which is not worn.
However, it is a best measure to drive slowly.
2) Hydroplaning