Kia Cadenza: Parking Brake System / Electric Parking Brake (EPB) Description and Operation
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.
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Emergency braking function by hydraulic brake malfunction |
EPB Function
| 1. |
Switch Operation at Stationary Condition (Static Park)
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Manually engage the parking brake by operating the EPB switch at stationary condition. |
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With the ignition switch ON, the parking brake is engaged by the Reduced Clamp Force at less than 8% of slope. |
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Except for the above, it is always engaged by the Full Clamp Force. |
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| 2. |
Switch Release at Stationary Condition (Static Release)
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Release the parking brake by manually operating the EPB switch at stationary condition. |
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To secure safety, it is only released with ignition switch ON and the brake pedal pressed. |
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| 3. |
Dynamic Emergency Braking (Dynamic Braking)
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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. |
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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. |
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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. |
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| 4. |
Automatic Application of EPB Force (Auto Apply)
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Stop the vehicle with the Auto Vehicle Hold (AVH) switch ON,
and then the EPB will be automatically applied when turning off the
engine. |
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| 5. |
Automatic Release of EPB Force (Drive Away Release)
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The parking brake will be automatically released when pressing the accelerator pedal with the EPB engaged. |
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To secure safety for automatic release, it will be automatically released only when all of the following conditions are met: |
| 3) |
Door, trunk and hood closed |
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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. |
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| 6. |
Reapplication of EPB Force When Vehicle Moves Downwards (Roll Away Reclamp)
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Additional EPB force is generated when a downward vehicle movement is detected after applying EPB force. |
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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). |
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| 7. |
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.
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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:
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The driver''s seat belt is unfastened and driver''s door is opened |
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The engine hood is opened |
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The shift lever is in P (Park) |
For your safety, the Auto Hold automatically switches to EPB in such cases:
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The driver''s seat belt is unfastened and driver''s door is opened |
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The engine hood is opened |
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The vehicle is in a standstill for more than 10 minutes |
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The vehicle is standing on a steep slope for a long period of time |
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The vehicle moved several times
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| 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. |
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| 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. |
Components
1. EPB Unit2. EPB Switch3. Brake Caliper 4. EPB Warning Lamp5. AUTO HOLD Lamp
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EPB Circuit Diagram
EPB connector input/output
Pin No.Description1CAN_High2CAN_Low18IGN (+)19EPB Switch Signal 121EPB Switch Signal 327EPB Switch Signal 229EPB Switch Signal 433Rear Left Motor ( ...
Other information:
Components
1. Coking nut2. Brake disc3. Hub4. Dust cover5. Knuckle6. Wheel bearing7. Snap ring8. Drive shaft
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Removal
1.
If the compressor is marginally operable, run the engine at
idle speed, and let the air conditioning work for a few minutes, then
shut the engine off.
2.
Disconnect the negative cable from the battery.
3.
Recover the refrigerant with a recovery/charging station.
4.
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Electric Parking Brake (EPB) Components and Components Location
Electric Parking Brake (EPB) Schematic Diagrams