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Service bulletin TSBCHA052

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)
TypeService bulletin
NHTSA id10089785
Published by NHTSA2017-01-27
Manufacturer's numberTSBCHA052
Manufacturer's date2015-02-02
NHTSA componentSERVICE BRAKES

NHTSA's summary

TSB: NOISE DURING BRAKE ACTUATION - THIS BULLETIN PROVIDES INFORMATION TO ADDRESS A BRAKE NOISE CONCERN ON SOME OPTIMA HYBRID (TF HEV) VEHICLES, PRODUCED FROM DECEMBER 2, 2013 THROUGH OCTOBER 22, 2014, WHICH MAY EXHIBIT A “SQUEAKING” AND/OR “HONKING” NOISE WHEN APPLYING THE BRAKES RAPIDLY. ACCESS THE TSB ON KGIS AND PRESS THE 'ATTACH FILES' BUTTON (UPPER RIGHT HAND CORNER) TO DOWNLOAD AND LISTEN TO THE SOUND FILE, IN ORDER TO BECOME FAMILIAR WITH THE PARTICULAR BRAKE NOISE. IF CONFIRMED, FOLLOW THE PROCEDURE OUTLINED IN THIS BULLETIN TO RESOLVE THE CONCERN.

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Brakes

Vehicles listed
KIA OPTIMA HYBRID2014 (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
20235292023-09-26. Brakes
23V6520002023-09-25. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
21V3310002021-05-10. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE
20V5190002020-08-27. SERVICE BRAKES, HYDRAULIC:ANTILOCK/TRACTION CONTROL/ELECTRONIC LIMITED SLIP:CONTROL UNIT/MODULE

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
TSB_CHA098_R32020-09-03. Service bulletin. TECHNICAL SERVICE BULLETIN: IBAU SYSTEM REPAIR FOR NOISE AND AIR BLEEDING - This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated by a black bar in the margin area. This bulletin provides the repair procedure for the Integrated Brake Actuation Unit (iBAU) system on some 2014-2019MY EV/Hybrid/Plug-In Hybrid vehicles listed (see table), which may exhibit a "honking" (Hissing) noise due to air remaining in the brake fluid system.
PS6752020-09-03. Service bulletin. PITSTOP - BRAKE CALIPER LEAK INSPECTION - This PITSTOP provides information related to a brake caliper fluid/oil substance found on some Kia vehicles, due to possible excess assembly oil applied during assembly.
TSB_CHA098_R22020-04-07. Service bulletin. TECHNICAL SERVICE BULLETIN: IBAU SYSTEM REPAIR FOR NOISE AND AIR BLEEDING - This bulletin has been revised to include additional information. This bulletin provides the repair procedure for the Integrated Brake Actuation Unit (iBAU) system on some 2014-2019MY EV/Hybrid/Plug-In Hybrid vehicles listed (see table), which may exhibit a “Honking” (Hissing) noise due to air remaining in the brake fluid system.
TSBCHA098_R12019-09-06. Service bulletin. TSBCHA098_R1: IBAU SYSTEM REPAIR FOR NOISE AND AIR BLEEDING - This bulletin has been revised to include additional information. This bulletin provides the repair procedure for the Integrated Brake Actuation Unit (iBAU) system on some 2014-2019MY EV/Hybrid/Plug-In Hybrid vehicles listed (see table), which may exhibit a "Honking" (Hissing) noise due to air remaining in the brake fluid system.
TSB CHA0672017-02-16. Service bulletin. THIS BULLETIN PROVIDES INFORMATION RELATED TO AN IBAU (INTEGRATED BRAKE ACTUATION UNIT) SOFTWARE UPGRADE FOR SOME 2014-2016 MY OPTIMA HYBRID (TF HEV) VEHICLES, PRODUCED FROM DECEMBER 2, 2013 THROUGH JULY 22, 2015, WHICH MAY EXHIBIT A MALFUNCTION INDICATOR LIGHT (MIL) ON WITH DTC C1356 AND NO DRIVABILITY CONCERNS. TO RESOLVE THE CONCERN, REPROGRAM THE IBAU USING THE GDS/KDS DOWNLOAD, AS DESCRIBED IN THIS BULLETIN.
PS4572017-02-08. Service bulletin. PITSTOP: VARIANT CODING INTEGRATED BRAKE ACTUATION UNITS (IBAU) - WHEN REPLACING THE INTEGRATED BRAKE ACTUATION UNIT, IT IS NECESSARY TO PERFORM VARIANT CODING OF THE NEW MODULE. FOR ADDITIONAL INFORMATION RELATED TO VARIANT CODING CLICK THE VARIANT CODES LINK ON THE KGIS HOME PAGE. (SEE PAGE 2 FOR SAMPLE SCREEN SHOT.)
PS4042017-01-30. Service bulletin. PITSTOP: HIGH-PITCHED SQUEAL NOISE BEFORE COMING TO A COMPLETE STOP - ON SOME VEHICLES, CUSTOMERS MAY COMPLAIN OF AN INTERMITTENT SQUEAL WHEN COMING TO A STOP. THIS CONCERN IS OFTEN DUE TO THE BRAKE PADS NOT FREELY FLOATING WITHIN THE CALIPER AND STICKING TO THE CALIPER BRACKET. THIS CONDITION MAY LEAD TO A VIBRATION AND NOISE WHICH IS HEARD DURING THE LAST PORTION OF BRAKE PEDAL TRAVEL, BEFORE COMING TO A COMPLETE STOP.
TT0392016-03-16. Service bulletin. SUMMARY TO BE PROVIDED ON A FUTURE DATE.