Hyundai Genesis: Parking Brake System / Electric Parking Brake (EPB) Description and Operation

Hyundai Genesis (DH) 2013-2016 Service Manual / Brake System / Parking Brake System / Electric Parking Brake (EPB) Description and Operation

Description
The EPB is an electronic parking brake.
The EPB is different from existing parking systems which are 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 of motor and gears. The braking power is generated when the motor pulls the cable connected to the brake system.
The EPB module is one of the parts of EPB system. It monitors the signal of the various sensors in the system, executes a self diagnosis, and controls EPB system with programmed logic.
Main Function
1.
Static Braking Mode
It controls the operation and cancellation condition of the vehicle when the vehicle stops.
(1)
The operation condition: Pull the EPB switch regardless of ignition switch ON / OFF & the brake pedal pressed condition. (Pull).
A.
The Vehicle speed <= 6kph
(2)
The cancellation condition: Push the EPB switch with the ignition switch ON and under the brake pedal pressed condition (Push).
2.
Dynamic Braking Function
DBF (Dynamic Braking Function): The DBF is the braking function which can operate or cancel the EPB system while driving. This function is used when foreign materials get in between the brake pedal or the brake hydraulic line cannot be operated.
(1)
The operation condition
It operates only when the vehicle speed is faster than 6kph and the EPB switch is pushed.
(2)
The cancellation condition: The system is cancelled by not pulling the EPB switch.
(3)
Principle of Operation
A.
ESC system is normal condition: EPB requests applying pressure of brake to ESP system.
B.
ESC system is abnormal condition: EPB operates the parking brake for reduction of speed.
(4)
Special feature
If the anti-lock is operated, the anti-lock control is performed, and the parking lamp on the cluster keeps blinking in case of emergency braking.
3.
DAR(Drive Away Release)
For the driver’s convenience, the EPB is automatically released releases when the driver shifts from P into R/N/D/S with the braked applied.
The EPB automatically releases with the accelerator pedal applied in D/R/S and the following conditions satisfied.
(1)
The driver’s side door must be closed and the seat belt must be fastened.
(2)
The hood must be closed in D
(3)
The trunk must be closed in R
4.
Bedding Mode
You must do "Bedding in process" for optimizing the initial operation performance of EPB after replacing the parking brake shoe and rear brake disc.
Bedding in Process
(1)
Ignition on, start engine.
(2)
Apply the foot brake 2 times within 10 seconds and keep applying the foot brake after the last application.
(3)
Apply the EPB switch 4 times, followed by 3 release applications within 10 seconds.
(4)
The linings must be bedded-in by 6 repeated dynamic braking procedures from 30~35 km/h to vehicle standstill. (If the vehicle speed is over 50 km/h at the Bedding Mode, it is automatically released.)
(5)
After each braking cycle a cooling period for the linings is necessary to prevent lining damage.
A.
The cooling can either be carried out via driving a 500 m distance after each braking cycle without the EPB application or via keeping the vehicle in standstill for 1 minute after each braking.
5.
Auto Hold
Auto Hold helps keep the vehicle in a stop condition by applying the hydraulic brake.
(1)
Condition for operation
A.
Engine running
B.
Auto hold switch ON.
C.
The driver's side door / Hood / Trunk should be closed.
D.
Seat belt fastened
E.
A gear shift is not P-range
F.
Coming to a perfect stop condition by hitting the brake pedal.
(2)
Auto hold function keeps the vehicle in a stop condition for maximum 10 minutes.
The ESP valve keeps the stop condition with the oil passage blocked by the pressure of the brake pedal.
(3)
Cumulative time of auto hold operation : Max. 30min
(4)
Automatic release function
Auto hold mode is released when driver starts to accelerate the vehicle by depressing pedal in D/ S/ R gear range.
(5)
Automatic convert the auto hold to EPB
Auto hold will convert EPB operation automatically If any of the following conditions is satisfied.
[Normal conversion case]
A.
In the case of opening the driver door and releasing the seat belt at the same time.
B.
In the case of opening the hood while the shift lever is D or S.
C.
In the case of opening the trunk while the shift lever is R.
D.
In the case of over 10 minutes of auto hold operation time.
E.
Stop at a slope of twenty five degrees.
[Abnormal conversion case]
A.
When sensing many detailed motions of the vehicle.
B.
When sensing the fault of ESP hydraulic system.
Warning Lamp

1.
EPB warning lamp
EPB warning lamp indicates the EP cutoff and malfunction.
EPB warning lamp turns ON in the following cases.
(1)
EPB warning lamp comes on for 3 seconds after the ignition switch is ON. If EPB system is working properly, EPB warning lamp goes OFF
(2)
If EPB system is not working properly, EPB warning lamp comes ON
(3)
Under diagnosis mode, EPB warning lamp comes ON
2.
AUTO HOLD lamp / AUTO HOLD function lamp
(1)
AUTO HOLD switch ON
A.
Brake system operates automatically when vehicle speed is “0”, in the case of parking or waiting at a red light, with the brake applied (AUTO HOLD function lamp : Green)
B.
Brake system is released automatically when the accelerator pedal is stepped on. (AITO HOLD lamp : White)
(2)
AUTO HOLD switch OFF : AUTO HOLD function does not operate.
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