2009 Hyundai Sonata
Problems, recalls and owner-reported issues
Service brakes is the leading concern among 460 owner complaints filed for this model year. This is the 10th highest complaint count among 26 Sonata model years with reports.
Of the 2009 reports, 21 involved a crash and 11 involved a fire. 26 people were injured.
What owners report most often
Recalls and investigations
Suspension, rearAug 12, 2013
Hyundai is recalling certain model year 2006-2010 Sonata vehicles manufactured March 1, 2005, through January 21, 2010; and model year 2006-2011 Azera vehicles manufactured September 27, 2005, through November 22, 2010 originally sold in, or currently registered in, Connecticut, Delaware, Illinois, Indiana, Iowa, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Wisconsin and the District of Columbia. Road salt and water can enter portions of the rear crossmember, leading to corrosion of the crossmember steel. This may lead to detachment of one of the rear control arms.
Control arm separation may suddenly change the rear wheel alignment, affecting the handling of the vehicle, increasing the risk of a crash.
Hyundai will notify owners, and dealers will repair or replace the crossmember assembly. The recall began on October 8, 2013. Owners may contact Hyundai Customer Care Center at 1-800-633-5151. Hyundai's recall number is 113.
Campaign 13V354000 on NHTSA.gov
Exterior lighting, brake lights, switchApr 1, 2013
Hyundai Motor Company (Hyundai) is recalling certain model year 2006-2009 Accent, model year 2007-2011 Azera, Sonata and Sante Fe,2006-2011 Tucson, 2009-2011 Elantra Touring, 2007-2010 Elantra, 2008-2011 Veracruz, 2009-2011 Genesis, 2010-2011 Genesis Coupe, 2007-2008 Entourage, and 2006-2008 Tiburon vehicles. Originally, in April 2013, Hyundai recalled 1,059,824 model year 2007-2009 Accent and Tucson, model year 2007-2010 Elantra, model year 2007-2011 Santa Fe, model year 2008-2009 Veracruz, model year 2010-2011 Genesis Coupe, and model year 2011 Sonata vehicles. In September 2013, Hyundai informed the agency that it was adding more vehicles to this campaign, representing an additional 652,512 units. The total number of vehicles being recalled is now 1,712,336. In the affected vehicles, the stop lamp switch may malfunction. A malfunctioning stop lamp switch may cause the brake lights to not illuminate when the brake pedal is depressed or may cause an inability to deactivate the cruise control by depressing the brake pedal. Additionally, a malfunctioning stop lamp switch may also result in intermittent operation of the push-button start feature, affect the operation of the brake transmission shift interlock feature, preventing the shifter from being moved out of the PARK position and cause the Electronic Stability Control (ESC) malfunction light to illuminate.
Failure to illuminate the stop lamps during braking or inability to disengage the cruise control could increase the risk of a crash. Additionally, when the ignition is in the 'ON' position, the transmission shifter may be able to be moved out of Park without first applying the brake. This may lead to unintentional movement of the car which may increase the risk of a crash.
Hyundai will notify owners, and dealers will replace the stop lamp switch, free of charge. The safety recall began on April 22, 2013. Owners may contact Hyundai at 1-800-633-5151. Hyundai's recall campaign number is 110.
Campaign 13V113000 on NHTSA.gov
Representative owner complaints: service brakes
98 reports, newest first. Show all
Electrical system, Other or unspecified, Service brakes, Jan 6, 2026
Brakes seize up while driving and then cannot move the vehicle. This causes a dangerous situation while driving and then breaks lock up and cannot move car even though vehicle is on and then stopped for a stop light. Car must then be turned off and sit for about 30 minutes so it can unseize and when that happens, you can then resume driving and then check engine light comes on. Brake lights were staying on even when vehicle is shut completely off. ABS and ESC lights stay on consistently and never turn off. Vehicle brake switch was replaced at Carolina Hyundai of high point, NC. So break lights have been repaired. They had to order the stop switch lamp replacement for recall as it was never done and will be fixed in next week. 3 door handles fell off and cannot open the rear driver side door at all. Window electric system won’t let windows go up and down and had to make a latch pull string to open driver door. Passenger door will not open at all and no handle and is a dangerous situation. Break switch not being replaced would have cause an electrical fire and is a complete dangerous vehicle even after being inspected less than a week ago
Service brakes, Sep 3, 2025
Brake Calipers are getting stuck often damaging the rotors and pads. This happens even for new calipers and rotors that won't last more than one year after replacement. The parts were original from manufacturer. The rear and front brakes were randomly getting stuck on one wheel after a period of using brakes. This put the vehicle in danger of getting fire from overheating rotors or increasing the risk of a crash because of an unusable brake system. This incident has repeated over time from 2017 till 2025 inducing big spendings for fixing brakes
Service brakes, Hydraulic, Service brakes, Oct 28, 2021
The contact owns a 2009 Hyundai Sonata. The contact stated while driving at an undisclosed speed, the contact heard a loud grinding noise coming from the rear of the vehicle. The contact took the vehicle to a local dealer to be inspected. The contact later discovered that the dealer only did a visual inspection of the brake pads and rotors. The mechanic stated that there were metal shavings from the brake pads and that the contact should wash the wheels to clear the metal shavings. The wheels were washed as instructed; however, the failure persisted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 181,000.
Service brakes, Jul 17, 2021
The problem as reported by so many others that the rear brake system has an inherent failure in the caliper/rotor/brake pads. I have vested nearly $2500.00 on the three for mentioned parts and labor over last 4 years. Between Midas and now a private mechanic have tried better lube on slide pins but the problem still persists. A little research states that the caliper piston doesn't retract from the rotors and in turn heating up the brake components to the point of failure. Some Law firms have stated the problem is a production flaw my problem with a system with this failure rate isn't recognized by the Hyundia. Calipers should simply last 80 to a 100 thousand miles under most driving conditions. Looking forward to your response. Kerry yakel
Service brakes, Dec 9, 2020
BRAKE LIGHT FAULTY IT STAYS ON CONTINUOUSLY.
Service brakes, Dec 9, 2020
BRAKE PEDAL LIGHT FAULTY STAYS ON ALWAYS.
Suspension, Service brakes, Sep 28, 2020
COMPLETE BREAK SYSTEM AS BEEN DONE AS WELL AS TIRES WITH ROTATIONS, HAVING TO REPLACE BRAKES AND ROTARS OFTEN. CONTINUES TO PULL HARD TO RIGHT WHILE DRIVING AND IS FAR FROM A SMOOTH RIDE. WHEN BREAKING THE CAR FEELS TO PULL FORWARD. THE EMERGENCY BREAK DOES NOT WORK AT ALL. THIS FEELS LIKE A NEVER ENDING ISSUE. THE CAR SEEMS TO SIT LOW ON ONE SIDE, HAVE TO TAKE IT TO GET LOOKED AT.
Electrical system, Other or unspecified, Service brakes, Jan 23, 2020
CHECK ENGINE LIGHT IS ON. HECU INTERNAL FAILURE. ACTIVE DTC PRESENT: C1237 PRIMARY PRESSURE SENSOR SIGNAL. SENSOR FAILURE INSIDE THE ABS CONTROL CYCLE. VALUES AT PRESSURE SENSOR CHANGED FROM 0.3 BAR TO 78.0 BAR; NO CHANGE IN SUPPLY VOLTAGE. SUPPLY VOLTAGE CONSTANTLY AT 14V. HYUNDAI HAS MENTIONED THAT THERE ARE NO ACTIVE RECALLS AND THAT THIS PART IS LIFE THREATENING IF IT FAILS - BUT SINCE THE WARRANTY HAS EXPIRED THEY ARE SHYING AWAY. ONLINE THERE ARE SEVERAL KNOWN ISSUES WITH HYNDAI AND HECU. SPECIALLY FOR MODELS BEFORE 2009. ITS HARD TO BELIEVE THAT HYUNDAI IS NOT AWARE OF THIS PROBLEM AND SEEMS LIKE THEY ARE AVOIDING THEIR RESPONSIBILITY AND PLAYING WITH HUMAN LIFE. WOULD APPRECIATE IF THE GOVERNMENT CAN DO SOMETHING.
Steering, Suspension, Service brakes, Jul 2, 2019
REAR END OF VEHICLE SWAYS AROUND AS IF DRIVING ON ICE. FEELS EXACTLY LIKE DESCRIPTIONS OF ISSUE WITH RECALL 13V354000. HYUNDAI SAYS VEHICLE IS NOT INCLUDED IN RECALL. EXCESSIVE PLAY IN REAR END, AND VERY NOTICEABLE BURNING SMELL COMING FROM REAR END AFTER DRIVING. CAUSING EXCESSIVE WEAR OF REAR BRAKES AND TIRES. HAS CAUSED REAR BRAKE HOSES TO FAIL. OCCASIONALLY BRAKE PEDAL SINKS TO FLOOR WHILE DRIVING IN STOP AND GO TRAFFIC. WHILE TRAVELING AT HIGHWAY SPEEDS, VEHICLE FEELS AS IF A GUST OF WIND COULD SEND IT OFF THE ROAD. NEED TO DO A TON OF STEERING TO KEEP THE CAR GOING STRAIGHT. FRONT END WAS ALIGNED 25,000 MILES AGO.
Power train, Service brakes, May 3, 2019
JERKING WHEN BRAKEING TO STOP OR WHEN SLOWING TO MAKE A TURN. TAKENSEVERAL TIMES FOR SERVICE BUT UNABLE TO DUPLICATE THE PROBLEM, NO EGINE LIGT HAS COME ON THEREFORE THEY CAN NOT REPAIR. PLEASE WE NEED YOUR HELP.
Service brakes, Feb 28, 2019
ISSUE 1 AT 29,476 MILES, 23 SEPT 2011. REAR BRAKES SEIZED DUE TO REAR CALIPER SLIDES STICKING. PADS AND ROTORS REPLACED UNDER WARRANT BY DEALER, BILL MARSH TRAVERSE CITY, MI . REPAIR ORDER 737578. ISSUE 2 REAR BRAKES NOISE AND WORN. 69,385 MILES. 29 MAY 14. REAR CALIPER PISTON SEIZED. NEW CALIPERS, PADS AND ROTORS. REPAIR ORDER 771872. ISSUE 3, REAR BRAKES NOISE AND HOT. 104, 051 MILES. 24 OCT 2017. RR CALIPER SEIZED. PADS, ROTORS BOTH SIDES REAR AND FRONT REPLACED. RIGHT REAR CALIPER REPLACED. BILL MARSH RO NO 427604. ISSUE 4 REAR BRAKES NOISE. TRAVERSE REAR CALIPER FAILED AGAIN. REAR ROTORS, PADS, AND RR CALIPER REPLACED. 28 FEB 2019. BILL MARSH HYUNDAI REPAIR ORDER 432896. 4 REPLACEMENTS OF RIGHTREAR BRAKE CALIPER , BRAKE PAD, AND ROTORS ARE EXCESSIVE AND ABNORMAL. THIS MODEL YEAR SONATA SHOULD BE ADDED TO RECALL FOR REAR BRAKES. MANY MORE COMPLAINTS OF PREMATURE REAR BRAKES FAILURE ARE NOTED ONLINE FOR MODEL YEARS 2009, 2010. BRAKES GET EXTREMELY HOT AND FUEL ECONOMY SUFFER GREATLY WHEN THIS FAILURE OCCURS.
Electronic stability control (ESC), Service brakes, Jul 26, 2018
MY BRAKE LIGHT STOP SWITCH BROKE INTO PIECES WITH NORMAL USE SO THE BRAKE LIGHTS STAY ON WHEN CAR IS TURNED OFF. MY FRONT BRAKE HOSE SPRUNG A FLUID LEAK THAT MADE THE BRAKES FULLY STOP WORKING IN THE MIDDLE OF A DRIVE. THE FRONT BRAKE HOSE SPLIT AND CRACKED PREMATURELY CUASING THE BRALE FLUID TO EMPTY OUT. THE BRAKE PEDAL WENT STRAIGHT TO THE FLOOR WITHOUT STOPPING THE VEHICLE WHEN THIS EVENT HAPPENED DURING A DRIVE. MY ESC LIGHT IS ON BIG PROBBLEM IM ASSUMING. MY PASSENGER AIR BAG LIGHT IS ON AS WELL BOTH INDICATE ARE OFF AND NON WORKING.
Service brakes, Apr 10, 2017
I OWN A 2009 HYUNDAI SONATA. WHILE OPERATING I NOTICED A SIGNIFICANT DECREASE IN SPEED, COASTING, FUEL ECONOMY, AND BRAKING DISTANCE. UPON PARKING MY CAR I SMELLED BURNING BRAKES. AS I WALKED PAST THE DRIVER REAR TIRE I COULD FEEL THE HEAT RADIATING FROM THE TIRE. I DIDN'T DARE TOUCH THE RIM FOR FEAR IT WOULD BURN ME. DIAGNOSIS REVEALED A SEIZED REAR DRIVER BRAKE CALIPER PISTON. THIS CAUSED RUINED THE REAR BRAKES AND PUT UNDUE STRESS ON THE FRONT BRAKES. I HAD TO REPLACE THE ENTIRE BRAKING SYSTEM AS THEY HAD ALL BECOME A SAFETY HAZARD. I PURCHASED AN EXTENDED WARRANTY WHICH COVERED THE REAR CALIPER REPLACEMENT BUT NOTHING ELSE. BURNING THROUGH BRAKES IS A SERIOUS SAFETY HAZARD. I HAVEN'T NOTIFIED THE MANUFACTURE OF THE FAILURE. THE FAILURE MILEAGE WAS 73,000.
Service brakes, Feb 17, 2017
STOP LAMP SWITCH REPLACEMENT. ON 01/14/17 I HAD AN APPOINTMENT AT PLAZA HYUNDAI LOCATED AT 2700 NOSTRAND AVE, BROOKLYN NY 11210 TO REPLACE MY STOP LAMP SWITCH. THEY DID NOT HAVE THE PART IN STOCK AT THAT TIME. THE PART WAS ORDERED ON 01/14/2017 AND AS OF THIS WRITING (02/17/2017) THEY HAVE NOT RECEIVED THE PART AND HAVE NO ESTIMATED TIME OR ARRIVAL ON THE PART. NO ONE EVEN NOTIFIED ME THAT THE CAMPAIGN WAS NOT COMPLETED. I HAD TO COME BACK IN THE FOLLOWING DAY 01/15/2017 BECAUSE MY BREAK LIGHTS WERE NOT TURNING OFF. AT THAT TIME THEY ATTEMPTED TO CHARGE ME FOR A DIAGNOSTIC, BUT I ADVISED THE MANAGER THAT I WAS THERE LESS THAN 24 HOURS AGO TO ADDRESS THE STOP LAMP SWITCH, WHICH MAY HAVE BEEN CAUSING THE ISSUE. THEY TOLD ME AT THAT TIME THAT THE PART WAS STILL ON ORDER. THEY REFUSE TO GIVE ME AN ETA. I CALLED HYUNDAI'S CORPORATE OFFICE, AND THEY COULD NOT GET AN ANSWER FROM PLAZA AUTO EITHER. THIS IS A SERIOUS RECALL AS IT EFFECTS MY ABILITY TO SIGNAL THAT I'M BREAKING. I WILL ATTEMPT TO GO TO ANOTHER SERVICE DEPARTMENT OR REMEDY MYSELF, BUT I THINK THAT THIS IS UNACCEPTABLE.
Service brakes, Feb 16, 2017
REAR BRAKE CALIPERS HAVE SEIZED AT LEAST 7 TIMES, CAUSING ME TO NEED TO REPLACE THEM. I'M AT 115,000 MILES AND HAVE HAD THE LEFT ONE SEIZE, DESTROYING THE ROTOR AND PAD 4 TIMES, AND THE RIGHT ONE SEIZE 3 TIMES (ONCE RECURRING WITHIN 15,000 MILES OF REPLACEMENT). THE CAR HAS BEEN REPAIRED AT DIFFERENT SHOPS, BUT THE PROBLEM KEEPS RECURRING. FIRST TIME OCCURRED SHORTLY AFTER 30,000 MILES. OCCURS EVERY 1-2 YEARS SINCE THEN. MOST RECENT OCCURRENCE IS NOW (CAR IS BEING REPAIRED THIS MORNING, LEFT REAR CALIPER/ROTOR/PAD). NOTICED MASSIVE SHIMMYING THIS TIME. PREVIOUS TIMES HAVE BEEN NOTICED FROM: GRINDING NOISE, CAR WON'T ACCELERATE OVER 10 MPH (LOCKED IN ENGAGED BRAKE MODE THAT TIME), AND SEVERE BUCKING WHILE BEING DRIVEN.
Service brakes, Dec 21, 2016
TL* THE CONTACT OWNS A 2009 HYUNDAI SONATA. AFTER THE VEHICLE WAS PARKED, AN ABNORMAL ODOR WAS PRESENT OUTSIDE THE REAR DRIVER SIDE OF THE VEHICLE. THE CONTACT ALSO STATED THAT A GRINDING NOISE WAS HEARD WHILE THE BRAKE PEDAL WAS DEPRESSED. THE VEHICLE WAS TAKEN TO A DEALER WHERE IT WAS DIAGNOSED THAT THE CALIPER FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED, BUT THE FAILURE RECURRED AFTER 7,000 MILES. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 60,000. THE VIN WAS NOT AVAILABLE. ...UPDATED 05/17/17 *BF *CN
Service brakes, Hydraulic, Dec 21, 2016
TL* THE CONTACT OWNS A 2009 HYUNDAI SONATA. AFTER THE VEHICLE WAS PARKED, AN ABNORMAL ODOR WAS PRESENT OUTSIDE THE FRONT DRIVER SIDE. THE CONTACT ALSO STATED THAT A GRINDING NOISE WAS PRESENT WHILE THE BRAKE PEDAL WAS DEPRESSED. THE DEALER DIAGNOSED THAT THE CALIPER FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED; HOWEVER, THE FAILURE RECURRED AFTER 7,000 MILES. THE MANUFACTURER WAS NOTIFIED. THE FAILURE MILEAGE WAS APPROXIMATELY 60,000. THE VIN WAS NOT AVAILABLE.
Service brakes, Nov 11, 2016
THE BRAKE LIGHT SWITCH IS NOT FUNCTIONING/BROKEN CAUSING THE BRAKE LIGHTS TO STAY ON AND ESC BUTTON IS NOT FUNCTIONING.
Service brakes, Oct 26, 2016
I HAVE OWNED THIS CAR SINCE JULY 2014. I PURCHASED THE CAR WITH 54K MILES. I CURRENTLY HAVE 107K MILES AND IT'S OCTOBER 2016.I HAVE HAD TO REPLACE MY BRAKES 4 TIMES, SPECIFICALLY BECAUSE THE REAR BRAKE CALIPERS FAIL CAUSING BRAKES TO LOCK WHILE DRIVING PRODUCING SIGNIFICANT HEAT AND DAMAGE TO THE BRAKE COMPONENTS. THE PROBLEM ALSO CAUSE A SIGNIFICANT LOSS OF FUEL ECONOMY. IT APPEARS THIS IS A COMMON PROBLEM ON THIS VEHICLE AND A RECALL HAS BEEN PUT IN PLACE STARTING IN MODEL YEAR 2011. THE RECALL NEEDS TO BE EXTENDED TO INCLUDE 2009 MODEL YEAR VEHICLES *TR
Service brakes, Oct 12, 2016
PURCHASED MY 2009 SONATA IN FEBRUARY 2009, BY MID JULY I HAD TO REPLACE THE REAR BRAKES. I WAS A LITTLE SURPRISED SINCE THE CAR WAS NEW AND ONLY HAD ABOUT 5000 MILES. I WAS TOLD THAT I WAS REQUIRED TO CHECK THE BRAKES EVERY 3500 MILES AND IT WASN'T COVERED UNDER WARRANTY, NOT EVEN THE 5 YEAR BUMPER TO BUMPER WARRANTY. IT IS NOW 2016 I HAVE HAD TO REPLACE MY REAR BRAKE CALIPERS, PADS AND ROTORS EVERY 6 MONTHS AT A COST OF OVER $400 EVERY TIME. THERE IS A GREAT DEAL OF GRINDING, HEAT AND MASSIVE VIBRATION IN THE REAR WHILE BRAKING TO THIS POINT. I HAVE RETURNED MY CAR FOR BOTH CURRENT RECALLS (NOT APPLICABLE TO BRAKES). WITH SO MANY MODELS HAVING THE SAME ISSUES, ITS VERY DISAPPOINTING THAT HYUNDAI WILL NOT REPAIR THEIR FAULTY ENGINEERING AND THE NHTSA HAS NOT INVESTIGATED THIS MAJOR SAFETY ISSUE WITH BRAKING SYSTEMS IN THESE CARS.
Vehicle speed control, Service brakes, Oct 10, 2016
UPON ACCELERATING UP AN ENTRANCE RAMP TO THE HIGHWAY, CAR ACCELERATED AT AN UNREASONABLE RATE OF SPEED TRIED USING BRAKES, BUT THEY WERE GONE. CAR HIT SPEEDS OF 60/65 MPH FOR MORE THAN 3 MILES ON A TURNPIKE. PARKING BRAKE DID NOT WORK, BRAKE PEDAL WAS DOWN TO THE FLOOR AND I COULD NOT CONTROL THE SPEED OF THE AUTO. AFTER TRAVELING MORE THAN 3 MILES, IN THE SHOULDER, I PUT THE GEAR INTO NEUTRAL AND THE CAR BEGAN TO SLOW DOWN AND FINALLY STOP. TOWED FROM TURNPIKE TO DEALERSHIP. KNOW THERE HAVE BEEN PROBLEMS WITH THE 2006 MODEL, BUT IS THERE ANYTHING SIMILAR TO MY EXPERIENCE WITH THE SONATA 2009.
Service brakes, Oct 9, 2016
A FEW MILE FROM HOME ON RURAL HIGHWAY DRIVERS SIDE REAR BRAKES SUDDENLY SEIZED LURCHING THE VEHICLE, TRANSMISSION DOWN SHIFTED, ENGINE RPM WENT WAY UP. UPON ARRIVING AT HOME, BRAKES WERE SMOKING HOT AND ON INSPECTION BRAKE PADS AND METAL ALMOST GONE, ROTOR HAD THINNED TO 1/4 ", AND METAL POWDER WAS ALL OVER THE RIM, SIDE AND REAR OF CAR.
Power train, Service brakes, Jun 14, 2016
TL* THE CONTACT OWNS A 2009 HYUNDAI SONATA. THE CONTACT STATED THAT WHILE DRIVING AT 10 MPH, THE BRAKE PEDAL WAS DEPRESSED AND A GRINDING NOISE EMITTED AS THE ESC WARNING LIGHT ILLUMINATED. THE FAILURE RECURRED NUMEROUS TIMES. THE VIN WAS NOT INCLUDED IN NHTSA CAMPAIGN NUMBER: 13V113000 (EXTERIOR LIGHTING SERVICE BRAKES, HYDRAULIC ). ON A SEPARATE OCCASION, THE GEAR LEVER FAILED TO SHIFT OUT OF PARK UNTIL AFTER SEVERAL ATTEMPTS. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED. THE FAILURE MILEAGE WAS 20,000. THE VIN WAS NOT AVAILABLE.
Service brakes, Apr 7, 2016
HAD TO REPLACE BRAKES TWICE. AFTER READING 200 COMPLAINTS ONLINE, I HAVE DISCOVERED IT IS AN ONGOING PROBLEM WITH ALL SONATAS. THE NEW BRAKES HAVE TO BE GROUND DOWN TO FIT THE SONATA.
Service brakes, Feb 29, 2016
THE REAR BRAKE CALIPERS APPEAR TO BE DEFECTIVE IN THAT A HIGH PERCENTAGE SEEM TO FAIL. THIS IS THE SECOND CALIPER THAT HAS REQUIRED REPAIR/REPLACEMENT, WHICH NECESSARILY ALSO REQUIRES REPLACEMENT OF BRAKE PADS AND ROTORS. IT APPEARS THAT THE CALIPERS STICK IN THE EXTENDED POSITION CAUSING (IN THE BEST CASE) THE RAPID WEAR OF THE ROTORS AND CALIPERS, AND (IN THE WORST CASE) A HEAT BUILD UP, AND A FAILURE OF THE BRAKES. INTERNET BLOGS INDICATE THAT THIS IS NOT JUST A PROBLEM WITH MY VEHICLE BUT IS SYSTEMIC WITH HYUNDAI SONATAS, AND PARTICULARLY 2009 AND LATER. I WILL NOTE THAT HYUNDAI HAD A BRAKE RECALL REGARDING CALIPERS FOR SONATAS BETWEEN 2011 AND 2014, BUT THAT IT DID NOT EXTEND TO THE 2009 SONATAS.