Hyundai Santa Fe: Parking Brake System. Electronic Parking Brake (EPB) / Description and operation

Hyundai Santa Fe (TM) 2019-2024 Service Manual / Brake System / Parking Brake System. Electronic Parking Brake (EPB) / Description and operation

Electronic parking brake (EPB) is motor driven braking system operated by a switch instead of pulling or depressing the lever to engage the brake. Pressing the button will deliver the electronic signal to ECU, and the ECU operates EPB actuator which consists of the gear and the motor. Then the motor inside the EPB spins and advances the nuts inside the caliper to engage braking force. EPB ECU, one of the parts consisting the EPB, recognizes the signals from various sensors to perform self-diagnosis and controls EPB according to the EPB control logic.
Main Function
Static Braking Mode
The operation and the cancellation at the stop condition of the vehicle
The operation condition: Pull the EPB switch irrespective of the brake pedal pressed condition. (Pull).
The Vehicle speed <= 3kph
The cancellation condition: Push the EPB switch at the ignition switch on & the brake pedal pressed condition. (Push).
Dynamic Braking Function
Dynamic Braking Function (DBF) : The DBF is the braking function at the driving condition, it can operate the EPB system and cancel it at the 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.
The operation condition
It operated only when the vehicle speed is faster than 3kph and the EPB switch is pushed.
The cancellation condition: It canceled when the pulling of the EPB switch is stopped.
Principle of Operation
ESP system is normal condition: EPB requests applying pressure of brake to ESP system.
ESP system is abnormal condition: EPB operates the parking brake for reduction of speed.
Anti-lock is operated when occurring wheel lock. Parking lamp on the cluster illuminates in the case of emergency braking.
Drive Away Release
Convenient for drivers, EPB is automatically released when driver shift from P into another (R/N/D/S) during braking.
Latching Run
This is reconnection function to operate EPB normally after emergency release.
After emergency release, when operating EPB first, the parking brake is operated to the maximum.
Reconnection function can be performed with the diagnostic tool.
After testing for reconnection 5 times, EPB isn’t be operated in the present ignition switch cycle when EPB doesn’t reconnect normally.
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
Ignition on, start engine.
Apply the foot brake 2 times within 10 seconds and hold applied after the last application.
Apply the EPB switch 4 times, followed by 3 release applications within 10 seconds.
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.)
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.
AVH (Automatic Vehicle Hold)
AVH supports to keep a stop condition of the vehicle by hydraulic brake at a stop.
Condition for operation
Engine run
AVH switch ON.
Closing driver door
Fastening driver seat belt
A gear shift is not P-range
Perfect stop condition with hitting the brake pedal.
AVH function holds stop condition of the vehicle for maximum 5 minutes.
VDC valve keeps stop condition because of intercept the oil passage with pressure occurred from brake pedal.
An accumulated time of AVH operation : Max. 30min
Automatic release function
AVH mode is released when driver attempts starting a vehicle by pedaling an acceleration pedal at the D/ S/ R range.
Automatically convert AVH to EPB
AVH 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 5 minutes of AVH 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

EPB warning lamp
EPB warning lamp indicates the EPB cut and malfunction.
EPB warning lamp comes ON below cases.
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
If EPB system is not working properly, EPB warning lamp comes ON
Under diagnosis mode, EPB warning lamp comes ON
AUTO HOLD lamp / AUTO HOLD function lamp
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)
Brake system is released automatically when step on the accelerator pedal. (AUTO HOLD lamp : White)
AUTO HOLD switch OFF : AUTO HOLD function does not operate.

    Parking Brake System. Electronic Parking Brake (EPB)


    Components and components location


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