Brake Master Cylinder Problems of Hyundai Sonata

On Nov. 17 while driving app. 65 mph on the highway the car suddenly shut itself off. All of the dashboard lights lit up & the car would not restart. After 10 min. Of trying to restart the car, the car started again, & all the lights on the car disappeared. The following day, while waiting in the turning lane at a red light, the car sputtered & turned off. All the lights on the dashboard lit up & the car wouldn't start I had the car towed on Nov 18 202 to a Hyundai dealership. The dealership reported that there was an internal short with the abs module & the hydraulic module assembly was replaced. On, Nov 24, I was driving the car & the car stalled all the warning lights went back on. I had the car towed the dealership where it stayed until December 11 the dealership stated that they could not find anything wrong with the car. I picked up the car on Dec 11 & the car appeared to be working normally. However, on dec19, while stopped at a red light, the car began to shake back & forth at idle & the rpms started to go up despite my foot being on the brakes. The car behind me saw what was happening & helped me pull over to the side of the road. I had the car towed to the dealership yet again. The dealership stated that they were able to duplicate the issue on Dec 23, 2020. However, no fix was done to the car. The dealership claimed that the car was in a �relearn� process & it would need more time for the car to �relearn� how to drive again. Everything seemed okay after the Dec 23 incident until Feb 8 2021 when I tried to stop while in traffic & the brakes would not work at all. I narrowly avoided getting into a major accident & once again brought the car to the dealership. The dealership found that the master cylinder assembly was internally defective & was not holding pressure and as a result the brakes were not working. The vehicle was returned to me on Feb 11 2021.

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I have a Hyundai Sonata. Its 2002 with 50,000 miles on it. The first time it gave me trouble, it was making a grinding sound while driving to work. The mechanic changed my caliber on one side of the car and replaced my hoses. Next month same sound started again. My mechanic changed the other caliber. Six months later. I started hearing that same sound and the brakes started locking. The mechanic didn't see anything wrong. Two weeks later, I lost my brakes while driving on interstate 10. I was able to coast to a stop without any incidents. I had my car towed to my mechanic. I was told I damaged the master cylinder. He put all new parts in my car (brake shoes,pads, calibers, master cylinder, etc. ) and tested it. The next day while driving on I-10, it started locking up again. It has baffled my mechanic. My car is still in the shop. I have spent over $1500. 00 on repairs of these brakes,not to mention the rental fees of cars for transportation. There must be an answer to what is causing my brakes to no function properly.

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As others have reported, the brake lines on my 2008 Sonata rusted through causing brake failure while driving on the highway. Repair costs near $600. Service manager states that "every one of these cars will be in for the same problem" due to the design. The two brake lines and two fuel lines which run from front to rear on the vehicle (under the driver's seat) are held in place with clips and then the entire length is covered with a rectangular plastic cover (or raceway). While this might work well in other climates, here in the northeast "salt belt", this cover traps the road salt which collects at the clips and rots through the steel brake lines. Fuel lines are not steel and are not affected. At the very least, Hyundai should require customers to bring the car in for service to have the cover removed and discarded, and the lines washed off and inspected. If corrosion is present, they should repair the damage. Due to the way the lines are routed, the position of the master cylinder and other components, the repair is costly - but is all labor. It is about $50 in parts and $500 in labor.

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The master cylinder failed while in a parking lot. A hard stop by hitting the curb.

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The brake pedal drops during braking with a clunk. The brakes are weak at that point but recover. I replaced the brake pads and rotors and master cylinder, still the same problem. It happens a lot. My wife won't drive the car anymore.

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Tl-the contact owns a 2011 Hyundai Sonata. The contact stated that while driving approximately 30 mph, the brake pedal was depressed but failed to operate and the contact would have to depress the brake pedal firmly to stop the vehicle. The contact discovered that the brake fluid was almost empty. The vehicle was repaired under NHTSA campaign number: 14v433000 (brakes). However, the failure persisted. The dealer diagnosed that the master cylinder had failed. The vehicle had not been repaired. The manufacturer was not notified of the failure. The failure mileage was unavailable. Ne.

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Over the past year, while traveling at various speeds, in various weather conditions my brake pedal very sporadically will not depress. The pedal is solid and will not move/respond for between 1 and recently up to about 6 seconds, which is a lifetime when you are trying to stop a car at 55 mph. Two auto shops have driven the car and can not recreate or diagnose the issue. Based on my own research, I finally resigned to have the master cylinder replaced. However, while the mechanic was replacing the mc he noticed that the vacuum hose had a metal clamp near the mc end and the clamp had shifted down the hose. Inside the hose, where the clamp had been, there appeared to be a spring loaded valve, possibly an internal check valve, which was now "loose" in the hose. It seems that if the clamp is in fact keeping the valve in place and it slowly drifts overtime this problem is something that would only appear with older cars. Also, I've seen reports on internet forums where others have described the same brake problem, however there is no recall listed for this issue. I don't know how many incidents need to be reported before action is taken, but as this is a life-threatening problem I would hope you treat it with urgency and investigate it fully.

The contact owns a 2011 Hyundai Sonata. While merging into another lane, the contact stated that the brakes were depressed and failed to engage. The contact pulled the emergency brake in order to stop the vehicle. The trunk would also open inadvertently. The dealer repaired the failure by replacing the master cylinder and module for the braking system and also advised the contact to open the trunk manually. The manufacturer was notified of the failure and filed a report. The failure mileage was 12,500 and the current mileage was 14,000. The VIN was unavailable.