Kia Cee'd: Parking Brake System / Electronic 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 Function
| 1. |
Static Switch Apply
| – |
Manual apply of EPB switch in stand still condition.
|
| – |
Clamping force control; When parked on less than 8% slope with
engine running, it is applied with Reduced Clamp Force(RCF);
Except for RCF condition, it is applied with full clamp force.
|
|
| 2. |
Reduced Clamp Force on Flat (RCF)
| – |
If EPB is applied on less than 8% slope, it is applied with
reduced clamp force.
|
| – |
When switch is pulled for more than 3 sec, it is clamped to
full clamp force.
|
|
| 3. |
Static (Switch) Release
| – |
Releasing EPB manually by switch
|
| – |
To prevent danger situation, it can be released only when ARC
is fulfilled.
|
Additional Release Condition (ARC)
| – |
To prevent unintentional release of EPB, there is condition
to be met before releasing;
Example: IGN On + [Brake Pedal pressed]
|
Child Safe (Release Inhibit)
| – |
With ignition switched off, EPB cannot be released.
|
|
| 4. |
Drive Away Assist (DAA)
The parking brake can be automatically released by slowing depressing
the accelerator pedal when all the conditions below are satisfied. (A/T
only)
| (2) |
Fasten the driver's seat belt.
|
| (3) |
Close the driver's door, engine hood and tailgate.
|
| (4) |
Depress the accelerator pedal while the shift lever is in R
(Rear), D (Drive) or Sports mode.
|
The parking brake can be automatically released by slowing depressing
the accelerator pedal while removing the foot from the clutch pedal
when all the conditions below are satisfied. (M/T only)
| (2) |
Fasten the driver's seat belt.
|
| (3) |
Close the driver's door, engine hood and tailgate.
|
| (4) |
Depress the clutch pedal with the gear engaged.
|
|
| 5. |
Dynamic Parking
| – |
When EPB switch is pulled in dynamic condition, dynamic deceleration
is generated by EPB actuator.
|
| – |
Clamp force will be controlled to avoid locking of the rear
wheels and ensure vehicle stability.
|
|
| 6. |
Roll Away Reclamp (RAR)
| – |
If vehicle rolls away, EPB gets reapplied.
; Vehicle movement is monitored via wheel speed.
; It can be active until CAN signal is available (3 min)
|
|
| 7. |
High Temperature Reclamp (HTR)
| – |
After detection of hot brakes, EPB will reapply from closed
brake state to compensate for loss of clamp force during cooling
of the brakes.
|
| – |
Activation condition: over 350°C
|
|
| 8. |
Pad Change Mode
| – |
Return the spindle nut fully for pad replacement
; This mode can be entered via hand tool connected to vehicle
with OBD2 connector.
; Piston can be pushed in after entering Pad change mode
|
|
| 9. |
Dynamic Standstill Detection (DSD)
This is how to operate the parking brake when there is no wheel speed
signal because of malfunction. Braking force can be applied while the
vehicle is in motion to slowly decelerate. If the EPB switch is continuously
pulled, then the parking brake can be engaged with maximum force.
|
| 10. |
P to X
EPB is automatically released when gear shift lever is moved from P
position;
Engine on + Brake pedal condition is necessary.
|
| 11. |
N to X
EPB is automatically released when gear shift lever is moved from Neutral
position to moving position. (D or R)
; It does not get released if the gear shift lever is moved to P or
passes through N rapidly.
; Engine on + Brake pedal condition is necessary.
|
Parking Brake Emergency Release
| – |
The following procedure is for releasing the parking brake when EPB
failure occurs.
|
| – |
This is the last resort for releasing the EPB when the parking brake
cannot be released electrically or by using a diagnosis scanner because
of motor or EPB damage, or power line disconnection.
|
| – |
The task must be performed on a flat surface and with safe surroundings.
When you release the parking brake, be sure to keep the vehicle stationary.
(Perform this task only after you make sure that preventive measures
are taken in case the vehicle moves when the parking brake is released.)
|
| 1) |
Use a standard hexagonal wrench to remove the screw (A) on the back
of the rear caliper (2 of them)
|
| 2) |
Using the same hexagonal wrench, turn the hexagon part on the floor
inside the spindle (B) clockwise by 0.5 - 1 complete turn.
|
| 3) |
The parking brake is released.
|
Components
1. EPB Unit
2. EPB Switch
3. Brake Caliper
4. EPB Warning Lamp
...
EPB Circuit Diagram (1)
EPB Circuit Diagram (2)
EPB connector input/output
Pin No.
Function
Pin No.
...
Electronic Parking Brake (EPB) Components and components location
Electronic Parking Brake (EPB) Schematic diagrams