SsangYong Actyon Sports II. Manual — part 140

09-8

Problem

Possible Cause

Action

Increased pedal stroke

Air in brake line

Bleed air

Oil leak

Repair

Worn brake pad

Replace

Excessive clearance between push rod and master
cylinder

Adjust

Worn or damaged piston seal

Replace

Brake dragging

Parking brake is not fully released

Release

Incorrect adjustment of parking brake

Adjust

Incorrectly adjusted clearance of parking brake shoe

Adjust

Faulty brake pedal return spring

Replace

Incorrectly adjusted free play of brake pedal

Adjust

Faulty master cylinder

Replace

Lack of lubrication in sliding parts

Lubricate

Faulty brake booster (vacuum leak)

Repair

Wear, hardening or poor contact of brake pad

Replace

Oil or water on lining

Repair or replace

Fixed or broken parking brake cable

Replace

Excessive stroke of brake lever

Adjust notch

Faulty auto clearance adjuster

Repair

Poor parking

brake

Increased stroke of
parking brake lever

Loosened parking brake cable

Adjust or replace

Incorrectly adjusted parking brake cable

Adjus

Defective automatic lining clearance adjuster

Repair or replace

Worn brake lining

Replace

09-9

4850-01

Problem

Cause

Action

Burning smell around
tire

Too frequent braking in high driving speed

Reduce the use of

foot brake/use

engine brake

properly

Used only foot brake during downhill driving

Driving with foot on brake pedal

Get off the foot from

pedal

Foreign materials such as dirt or sand in brake system

Replace: caliper,

wheel cylinder,

master cylinder,

return spring

Broken return spring in shoe assembly

Replace

Incorrectly adjusted parking brake cable

Adjust

Incorrect wheel or wheel cover
(generating the heat)

Replace

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

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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

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09-11

4850-01

4. AIR BLEEDING

Fill up the brake fluid up to "MAX" line on the

reservoir.

1.

Fill the reservoir with brake fluid and pump the

brake pedal several times. Then keep it

depressed.

2.

Loosen the bleed screw and collect the

bleeding brake fluid from the brake line with

the order in the figure.

3.

Fill the reservoir with the brake fluid as much

as it bleeded, and continue to bleeding

operation.

Never reuse the used brake fluid.

Use only specifies brake fluid (DOT 4). Add brake fluid between MAX and MIN lines on the

reservoir (0.7 to 0.8 liters).

Be careful not to splash the brake fluid on painted area or body.

Make sure that any foreign material does not get into brake line.

Always work with another staff.

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