window SSANGYONG NEW ACTYON SPORTS 2012 User Guide

09-10
This section describes the noise phenomena occurred possibly in the brake system operation.
Distinguish between the information given below and the actual problems and then, inspect the
vehicle and take appropriate measures.
Noise symptoms and Causes -
Symptom 1. If depressing the brake pedal when the engine is cold, "screeching" sound always
occurs and, after driving for a while, the sound disappears..
This usually occurs in the morning. When the temperature goes down, the dew condensation
phenomenon sets moisture on the brake disc as the window frost forms. Due to this moisture, the
iron within the brake disc and pad oxidizes, forming undetectable micro-rusts on the disc
surface. When starting the engine under this condition, noise may sound due to the friction of
micro-rusts. When operating the brake several times, the disc temperature goes up and the
micro-rusts come off and the noise goes away. Depending on the driving conditions, noise gets
louder when slightly depressing the brake pedal and oppositely, noise is smaller when deeply
depressing the brake pedal. This is simply a physical phenomenon, called "morning effect" in
professional terms, and does not imply any problems with the brake system.
Symptom 2. Slip or screech after the brake pad replacement.
This usually occurs when the bed-in is not made between the disc and the pad's friction material.
The bed-in is a state that the brake system normally works and gives no noise out, when, after
about 300 km city driving, the contact area of the pad friction material is enlarged and the disk is
in complete contact with the pad's friction material. Therefore, for some time after the brake
disk/pad replacement, the brake system poorly operates or noise (abnormal sound) occurs due
to the partial contact.
Symptom 3. "Groaning" sound occurs in the automatic transmission vehicle when slightly taking
the foot off the brake pedal to slowly start after waiting for the signal, or slightly depressing the
brake pedal.
This is the noise "Creep groan" that occurs when, in both the automatic and manual transmission,
slightly releasing the brake pedal in the neutral gear at downhill roads.
It frequently occurs at the low braking power and low speed, through the following process. When
operating the brake system at low speed and low pressure, adhesion and slip repeatedly take
place between the brake disk and the friction material, and this makes the braking power
inconstant, instantly increasing or decreasing, and gives out the brake noise.
It is also a physical phenomenon and has no relation with the brake performance.BRAKE OPERATION AND NOISE ▶

02-6
The windshield or windows can be broken due to impact from driver or passenger air bag
inflation.
When any repairs are needed to the air bag mounting area or its surrounding area, or when an
accident has occurred without the air bag deployment, have the air bag system/seat belt
pretensioner checked for safety.
The air bag is a unit to save an occupant's life from sudden accident and it inflates at a very
fast speed by gas with high temperature, which might cause injury, such as an abrasion, bruise
and burn depending on the accident conditions.
Normal inflation of the air bag could make a loud noise and smoke (non-toxic gas).
A minor collision, which occupants can be protected only by seat belts, will not activate the air
bag system. It is because that air bag inflation at a minor collision could cause more injury
such as an abrasion, bruise and burn.
Check the air bag system even though there is no fault in the air bag system when 10 years
have passed after air bag installation. -
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