# Service bulletin 20\-BR\-001H

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10172147
- Published by NHTSA: 2020\-03\-06
- Manufacturer's number: 20\-BR\-001H
- Manufacturer's date: 2020\-02\-12
- NHTSA component: SERVICE BRAKES, HYDRAULIC

## NHTSA's summary

This bulletin describes the procedure to properly bleed the brakes on Sonata HEV/PHEV \(LF\) and Ioniq EV/HEV/PHEV \(AE\) vehicles. This procedure applies when any air is introduced into the Active Hydraulic Boost \(AHB\) system, which consists of the pressure supply unit \(PSU\), and the integrated brake actuation unit \(IBAU\). Improper bleeding of the brake system can result in the presence of air, which may reduce braking effectiveness.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10172147-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10172147-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes

## Vehicles listed

- 2017 to 2019 HYUNDAI IONIQ ELECTRIC
- 2017 to 2019 HYUNDAI IONIQ HYBRID
- 2018 to 2019 HYUNDAI IONIQ PLUG\-IN HYBRID
- 2016 to 2019 HYUNDAI SONATA HYBRID
- 2016 to 2019 HYUNDAI SONATA PLUG\-IN HYBRID

## Recalls for the same vehicles and component

- [17V359000](/recalls/nhtsa/17V359000.md), 2017-06-05: PARKING BRAKE:INDICATOR LIGHT
- [2015516](/recalls/tc/2015516.md), 2015-10-29: Brakes

## Other bulletins for the same vehicles and component

- [23\-BR\-001H](/bulletins/10235346.md), 2023-05-02, Service bulletin: PARKING BRAKE. When servicing any of the specified vehicles below with the corresponding DTCs, C2416, “Motor Short or Open – LH \(EPB\)” or C2417 “Motor Short or Open – RH \(EPB\)”, follow the step\-by\-step procedures in this bulletin.
- [21\-BR\-004H](/bulletins/10191793.md), 2021-05-05, Service bulletin: PARKING BRAKE. This bulletin describes the procedure to update the EPB \(Electronic Parking Brake\) ECU to revise the logic of setting DTC C2416, “Motor Short or Open – LH \(EPB\)” or C2417 “Motor Short or Open – RH \(EPB\)” from vibrations while driving on certain roads.
- [21\-BR\-002H](/bulletins/10190038.md), 2021-04-07, Service bulletin: SERVICE BRAKES; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This bulletin provides best practice recommendations when performing brake service procedures.
- [20\-BR\-002H](/bulletins/10183963.md), 2020-12-08, Service bulletin: SERVICE BRAKES. This bulletin describes the procedure to inspect and identify fluid which may appear around the brake caliper area.
- [20\-HA\-001H](/bulletins/10173552.md), 2020-04-07, Service bulletin: SERVICE BRAKES, AIR:SUPPLY:COMPRESSOR. This bulletin provides additional service diagnostic information and repair procedures related to electric A/C compressors equipped in hybrid electric vehicles, plug\-in hybrid electric vehicles, and electric vehicles.
- [20\-AT\-011H](/bulletins/10173548.md), 2020-04-07, Service bulletin: SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR. If you are servicing an applicable vehicle with a “Check Engine” light on and one or more of the DTC listed below, follow the repair procedure and replace the related solenoid and oil pressure harness.
- [5NP\-N7X7S\-09](/bulletins/10082432.md), 2016-10-14, Service bulletin: ELECTRICAL SYSTEM; PARKING BRAKE. "HYUNDAI MOTOR AMERICA IS CONDUCTING A SERVICE CAMPAIGN TO UPDATE THE ELECTRIC PARKING BRAKE\(EPB\)LOGIC ON CERTAIN 2016 SONATA VEHICLES. SERVICE CAMPAIGN TFF PROVIDES A PROCEDURE TO UPDATE THE EPB LOGIC."
- [5NP\-G7F6N\-09](/bulletins/10082365.md), 2016-10-13, Service bulletin: PARKING BRAKE. 2016MY SONATA VEHICLES EQUIPPED WITH THE OPTIONAL ELECTRIC PARKING BRAKE \(EPB\) INCORPORATE A FEATURE TO MEASURE THE CLEARANCE BETWEEN THE BRAKE PAD AND ROTOR ASSEMBLIES. IF THE PARKING BRAKE IS NOT APPLIED AT LEAST ONCE WITHIN A 1,000 KM PERIOD, SELF\-CHECK SOFTWARE WILL ACTIVATE THE REAR BRAKE PADS \(APPLY/RELEASE\) AFTER THE VEHICLE IS PLACED IN PARK AND THE IGNITION IS TURNED OFF. DUE TO THE SYSTEM’S LOGIC, IT IS POSSIBLE FOR THE REAR BRAKE PADS TO REMAIN IN CONTACT WITH THE ROTORS AFTER THIS VERIFICATION PROCESS, AND THE REAR BRAKES MAY “DRAG” DURING THE NEXT DRIVE CYCLE REQUIRING THE CUSTOMER TO RELEASE THE PARKING BRAKE. THIS BULLETIN DESCRIBES THE SERVICE PROCEDURE TO UPDATE THE EPB CONTROL LOGIC \(CONTROLLED BY THE ELECTRONIC STABILITY CONTROL \(ESC\) MODULE\) TO ENSURE THE EPB IS LEFT IN THE CORRECT STATE FOLLOWING THE CLEARANCE VERIFICATION PROCESS.

JSON: [/v1/bulletins/10172147](/v1/bulletins/10172147)

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