Kia Optima Hybrid: Parking Brake System / Electric Parking Brake (EPB) Description and Operation

Kia Optima Hybrid (TF HEV) 2016-2020 Service Manual / Brake System / Parking Brake System / Electric Parking Brake (EPB) Description and Operation

Description

Description of EPB

The EPB is an electronic parking brake. The EPB is different from existing parking systems which operated with the brake pedal or the lever type. The EPB system sends the signal to the ECU when a driver operates the EPB switch. The ECU operates the EPB actuator composed with motor gears. EPB has several functions.

–	Static apply

–	Emergency braking function by hydraulic brake malfunction

–	Auto apply

EPB Function

Switch Operation at Stationary Condition (Static Park)

–	Manually engage the parking brake by operating the EPB switch at stationary condition.

–	With the ignition switch ON, the parking brake is engaged by the Reduced Clamp Force at less than 8% of slope

–	Except for the above, it is always engaged by the Full Clamp Force.

Switch Release at Stationary Condition (Static Release)

–	Release the parking brake by manually operating the EPB switch at stationary condition.

–	To secure safety, it is only released with ignition switch ON and the brake pedal pressed.

Dynamic Emergency Braking (Dynamic Braking)

–	Electric Controlled Deceleration (ECD) : When operating the EPB switch while driving, the operation request is sent to VDC only during the switch operation, in order to perform hydraulic braking by the VDC, not by the EPB actuator.

–	Rear Wheel Unlocker (RWU) : If the VDC is not normally operated (VDC Fail) by operating the EPB switch while driving and wheel speed information can be obtained, the EPB actuator will independently maintain the vehicle''s movement safely to perform braking only during the switch operation.

–	Slow Ramp Up (SRU): If the VDC is not normally operated (VDC Fail) by operating the EPB switch while driving and wheel speed information cannot be obtained, the EPB will independently increase the parking force gradually to perform braking only during the switch operation.

Automatic Application of EPB Force (Auto Apply)

–	Stop the vehicle with the Auto Vehicle Hold (AVH) switch ON, and then the EPB will be automatically applied when turning off the engine.

Automatic Release of EPB Force (Drive Away Release)

–	The parking brake will be automatically released when pressing the accelerator pedal with the EPB engaged.

–	To secure safety for automatic release, it will be automatically released only when all of the following conditions are met:

1)	Engine turned on

2)	Seatbelt fastened

3)	Door, trunk and hood closed

–	To prevent the vehicle from being moved downwards on a slope way, it will be automatically released only when driving torque above specific level based on the slope has been obtained.

Reapplication of EPB Force When Vehicle Moves Downwards (Roll Away Reclamp)

–	Additional EPB force is generated when a downward vehicle movement is detected after applying EPB force.

–	With the engine OFF, this function is enabled only while the wheel speed information can be received (i.e., for 3 minutes after the engine is turned off).

P to X (Automatic Release of EPB Force for Gear Shifting)

When moving the gearshift lever from the P or N position to the D or R position, the parking brake will be automatically released.

However, it will be possible only with the engine ON and the brake pedal pressed, in order to secure safety for automatic release.

Auto Hold

The Auto Hold maintains the vehicle in a standstill even though the brake pedal is not depressed after the driver brings the vehicle to a complete stop by depressing the brake pedal.

The Auto Hold does not operate when:

–	The driver''s seat belt is unfastened and driver''s door is opened

–	The engine hood is opened

–	The trunk is opened

–	The shift lever is in P (Park)

–	The EPB is applied

For your safety, the Auto Hold automatically switches to EPB in such cases:

–	The driver''s seat belt is unfastened and driver''s door is opened

–	The engine hood is opened

–	The trunk is opened

–	The vehicle is in a standstill for more than 10 minutes

–	The vehicle is standing on a steep slope for a long period of time

–	The vehicle moved several times

(1)

Set up

(1)	With the driver''s door, engine hood and trunk closed, fasten the driver''s seat belt or depress the brake pedal and then press the Auto Hold button. The white AUTO HOLD indicator will come on and the system will be in the standby position.

(2)	When you stop the vehicle completely by depressing the brake pedal, the AUTO HOLD indicator changes from white to green.

(3)	The vehicle will remain stationary even if you release the brake pedal.

(4)	If EPB is applied, Auto Hold will be released and the indicator will change to white.

(2)

Leaving

If you want to release it manually, pull the EPB switch while depressing the brake pedal. The AUTO HOLD indicator changes from green to white and the system changes to the standby position.For your safety, release the Auto Hold operation manually if the vehicle ahead is too close or during downhill driving.

Electric Parking Brake (EPB) Components and Components Location

Components 1. EPB Unit2. EPB Switch3. Brake Caliper 4. EPB Warning Lamp5. AUTO HOLD Lamp ...

Electric Parking Brake (EPB) Schematic Diagrams

EPB Circuit Diagram (1) EPB Circuit Diagram (2) EPB connector input/output Pin DescriptionPin Description1--21--2--22YC-CAN (Low)3--23WC-CAN (High)4--24WElectric Parking Brake Switch (SW1)5--25L/OElectric ...

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