Hyundai Santa Fe (TM): Brake System / Parking Brake System. Electronic Parking Brake (EPB)

Hyundai Santa Fe (TM) 2019-2023 Service and Repair Manual / Brake System / Parking Brake System. Electronic Parking Brake (EPB)

Description and operation

Description
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
1.
Static Braking Mode
The operation and the cancellation at the stop condition of the vehicle
(1)
The operation condition: Pull the EPB switch irrespective of the brake pedal pressed condition. (Pull).
–
The Vehicle speed <= 3kph
(2)
The cancellation condition: Push the EPB switch at the ignition switch on & the brake pedal pressed condition. (Push).
2.
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.
(1)
The operation condition
It operated only when the vehicle speed is faster than 3kph and the EPB switch is pushed.
(2)
The cancellation condition: It canceled when the pulling of the EPB switch is stopped.
(3)
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.
(4)
Peculiarity
Anti-lock is operated when occurring wheel lock. Parking lamp on the cluster illuminates in the case of emergency braking.
3.
Drive Away Release
Convenient for drivers, EPB is automatically released when driver shift from P into another (R/N/D/S) during braking.
4.
Latching Run
This is reconnection function to operate EPB normally after emergency release.
Operation
(1)
After emergency release, when operating EPB first, the parking brake is operated to the maximum.
(2)
Reconnection function can be performed with the diagnostic tool.
(3)
After testing for reconnection 5 times, EPB isn’t be operated in the present ignition switch cycle when EPB doesn’t reconnect normally.
5.
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.
6.
AVH (Automatic Vehicle Hold)
AVH supports to keep a stop condition of the vehicle by hydraulic brake at a stop.
(1)
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.
(2)
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.
(3)
An accumulated time of AVH operation : Max. 30min
(4)
Automatic release function
AVH mode is released when driver attempts starting a vehicle by pedaling an acceleration pedal at the D/ S/ R range.
(5)
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

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. (AUTO HOLD lamp : White)
(2)
AUTO HOLD switch OFF : AUTO HOLD function does not operate.

Components and components location

Components

1. ESP Control Module (HECU)
2. EPB switch
 3. Electronic Parking Brake (EPB) actuator

Schematic diagrams

Circuit Diagram

Terminal Function

Pin No
Fuction
Pin No
Fuction
6
 Electrical parking brake signal 1
 2
 Rear right EPB motor power
7
 Electrical parking brake signal 2
 3
 Rear right EPB motor ground
8
 Electrical parking brake signal 3
 12
 Rear left EPB motor ground
9
 Electrical parking brake signal 4
 13
 Rear left EPB motor power

Repair procedures

Removal
  
•
Be careful not to damage the parts located under the vehicle (floor under cover, fuel filter, fuel tank and canister) when raising the vehicle using the lift.
(Refer to General Information - "Lift and Support Points")
[EPB Switch]
1.
Turn ignition switch off and disconnect the battery (-) cable from the battery.
2.
Remove the floor console upper cover.
(Refer to Body - "Floor Console")
3.
Disconnect the EPB switch connector (A).
4.
Remove the EPB switch (A) after loosening the screw.
[EPB Actuator]
1.
Turn ignition switch off and disconnect the battery (-) cable from the battery.
2.
Remove the rear wheel and tire.
3.
Remove the EPB actuator from rear caliper.
(Refer to Brake System - "Rear Disc Brake")

    Troubleshooting 1. Part diagnosis Items Cause Symptom Switch fuse Faulty fuse connection, Damaged fuse – DTC Code : P0504 – Symptom : Shifting gear trouble, Starting failure, Cruise control function cancelation trouble, EPB function cancelation trouble, Stop lamp lighting trouble, ESP OFF light illuminated.

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