Page 557 of 751

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
cylinderAdjust
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 leverLoosened parking brake cable Adjust or replace
Incorrectly adjusted parking brake cable Adjus
Defective automatic lining clearance adjuster Repair or replace
Worn brake lining Replace
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09-12
Air bleed screw at front brake 5.Air bleed screw at rear brake 4.
Repeat the air bleeding procedures until clear
brake fluid comes out of air bleed screw. 6.
Check for oil leaks from the brake lines. 7.
Air in brake
fluid
Deteriorated
fluid
Air bleed screw at front brake
Air bleed screw at rear brake
Air bleeding completed
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09-134850-01
Maximum Stroke of Brake Pedal ▶
Check the brake pedal with below procedures: -
Start the engine.
Pump the brake pedal around 3 times.
Depress the brake pedal with approx. 30 kg
and measure the distance (A) between the
upper surface of pedal pad and the lower
dash panel.
If the measured value is out of the specified
value, adjust the length. 1.
2.
3.
4.
Specified value (A)150mm
5. BRAKE SYSTEM CHECK
Over the specified value
Cause Action
Worn brake pad Replace
Worn brake shoe Replace
Improper stroke of hand
brakeAdjust
Air in brake line Air bleeding
Oil leak Repair or replace
Brake booster push rod Replace or adjust
Improperly adjusted
stopper boltAdjust
Below the specified value
Cause Action
Brake booster push rod
Replace or adjust
Air in brake fluid Replace
Improperly adjusted
stopper boltAdjust
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09-174850-01
Brake Fluid ▶
Brake Fluid Type ▶ 1. Color
Ligh gold (New oil) → Brown → Black -
2. Service Interval/Type
Change: every 2 years, Type: DOT4
The water in the brake fluid has an adverse effect to the brake system. If the fluid contains
around 3% of water, the boiling point of the brake fluid goes down by 25%. It will cause the vapor
lock frequently.
Water content in fluid: around 3% after 18 months, around 7~10% after few years
The water ib fluid makes the corrosion in the brake lines, deforms and deteriorates the rubber
components, brake calipers and pistons. -
DOT4: Brake fluid for premium vehicle. Lower water absorbing rate AND higher boiling point than
DOT3
Brake Fluid Level Check ▶
The brake fluid level should be between "MAX"
and "MIN" on the reservoir. If it is below "MIN"
mark, check for oil leaks and refill the reservoir
with the specified fluid.
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09-194850-01
Clean the dissembled components and visually check the followings:
Damage and tear on boot 4.
Uneven wear and oil contamination 5.
Damage, crack and wear on cylinder body (A)
and guide pin (B) 6.
Wear, rust and damage on the cylinder and
piston
Scratch and bending on disc plate 7.
8.
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10-214892-01
2) DUMP (ABS is working) Mode
Even when the hydraulic pressure on each circuit is constant, the wheel can be locked as the wheel
speed decreases. This is when the ABS HECU detects the wheel speed and the vehicle speed and
gives the optimized braking without locking the wheels. In order to prevent the hydraulic pressure from
increasing, the inlet valve will be closed, the outlet valve will be opened and the oil will flow into the low
pressure chamber. In addition, the ABS HECU operates the pump to circulate the oil in the low pressure
chamber to the master cylinder. This may make the driver to feel the brake pedal vibration and some
Solenoid valve Valve Open/Close Pump motor
Inlet valve - Normal open (NO) valve Close
ON
Outlet valve - Normal close (NC) valve Open
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10-234892-01
4) RISE (ABS is working) Mode
As the wheel speed increases, the inlet valve opens and the wheel's pressure increases due to the
master cylinder pressure. In addition, the pump circulates the oil in the low pressure chamber to the
wheel. As the hydraulic pressure to the wheel increases, the wheel speed will reduce. This operation
continues repetitively until there are no signs that the ABS HECU tends to lock the wheels. Since the
ABS hydraulic pressure control process takes place repeatedly for a short time, there may be some
vibration and noises at the brake pedal.
Solenoid valve Valve Open/Close Pump motor
Inlet valve - Normal open (NO) valve Open
ON
Outlet valve - Normal close (NC) valve Close
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11-94890-10
ESP OFF switch
Located on the left side of
instrument panel.
Rear wheel speed sensor
Located on the both ends of
rear axle.Front wheel speed sensor
Located on the hub assembly.Sensor cluster
Located at the bottom of center
fascia panel.
Steering wheel angle sensor
Located on column shaft with
contact coil.HECU assembly
Located near the brake booster
in engine compartment and
contains the pressure sensor.
2. COMPONENTS