Hyundai Ioniq: Parking Brake System / Electric Parking Brake (EPB). Description and operation

Hyundai Ioniq (AE) 2017-2024 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 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. The braking power occurs 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, controls EPB system with programmed logic.
Main Function
1.
Static Braking Mode
It controls the operation and cancellation condition of the vehicle when stopping
(1)
The operation condition : Pull the EPB switch regardless of ignition switch ON / OFF & the brake pedal pressed condition. (Pull).
The Vehicle speed <= 6kph
(2)
The cancellation condition : Push the EPB switch at the ignition switch on & the brake pedal pressed condition. (Push).
2.
Dynamic Braking Function
DBF (Dynamic Braking Function) : The DBF is the braking function during driving condition, it can operate the EPB system and cancel during vehicle driving condition. This function will be used while foreign materials get in between the brake pedal or the brake hydraulic line can not be operated.
(1)
The operation condition
It operated only when the vehicle speed is faster than 6kph and the EPB switch is pushed.
(2)
The cancellation condition : pulling of the EPB switch cancels condition.
(3)
Principle of Operation
ESC system is normal condition : EPB requests applying pressure of brake to ESP system.
ESC system is abnormal condition : EPB operates the parking brake for reduction of speed.
(4)
Peculiarity
Anti-lock is operated when occurring wheel lock. Parking lamp on the cluster is flickered in the case of emergency braking.
3.
DAR (Drive Away Release)
For the driver’s convenience, the EPB automatically 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 below conditions satisfied.
(1)
The driver’s side door must be closed and the seat belt must be on.
(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 hold applied 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.
The cooling can either be carried out via driving a 500 m distance after each braking cycle without any apply of the EPB or via keeping the vehicle in standstill for 1 minute after each braking.
5.
Auto Hold
Auto hold helps keep vehicle in a stop condition by applying hydraulic brake at a stop.
(1)
Condition for operation
Engine run
Auto hold switch ON.
The driver's side door / Hood / Trunk should be closed.
Fastening driver seat belt
A gear shift is not P-range
Perfect stop condition with hitting the brake pedal.
(2)
Auto hold function holds stop condition of the vehicle for maximum 10 minutes.
ESP valve keeps stop condition because of intercept the oil passage with pressure occurred from brake pedal.
(3)
An accumulated 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 when in D/ S/ R gear range.
(5)
Automatically convert auto hold to EPB
Auto hold will convert EPB operation automatically if any one satisfy conditions below.
[Normal conversion case]
In the case of driver door open & Driver seat belt release at the same time
In the case of opening the hood while the shift lever is D or S.
In the case of opening the trunk while the shift lever is R
In the case of over 10 minutes of auto hold operation time
Stop at a slope of twenty five degrees
[Abnormal conversion case]
When sensing detailed motion of the vehicle.
When sensing the fault of ESP hydraulic system.
Warning Lamp

1.
EPB warning lamp
EPB warning lamp indicates the EPB cut and malfunction.
EPB warning lamp comes ON below 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, during braking (AUTO HOLD function lamp : Green)
B.
Brake system is released automatically when step on the accelerator pedal. (AITO HOLD lamp : White)
(2)
AUTO HOLD switch OFF : AUTO HOLD function does not operate.

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