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.

The communication, as NHTSA indexes it (as of 2026-10-19)
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

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Brakes

Vehicles listed
HYUNDAI IONIQ ELECTRIC	2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
HYUNDAI IONIQ HYBRID	2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
HYUNDAI IONIQ PLUG-IN HYBRID	2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
HYUNDAI SONATA HYBRID	2016, 2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)
HYUNDAI SONATA PLUG-IN HYBRID	2016, 2017, 2018, 2019 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
17V359000	2017-06-05. PARKING BRAKE:INDICATOR LIGHT
2015516	2015-10-29. Brakes

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
23-BR-001H	2023-05-02. Service bulletin. 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	2021-05-05. Service bulletin. 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	2021-04-07. Service bulletin. This bulletin provides best practice recommendations when performing brake service procedures.
20-BR-002H	2020-12-08. Service bulletin. This bulletin describes the procedure to inspect and identify fluid which may appear around the brake caliper area.
20-HA-001H	2020-04-07. Service bulletin. 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	2020-04-07. Service bulletin. 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	2016-10-14. Service bulletin. "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	2016-10-13. Service bulletin. 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.