2021 Kia K5

After coming to a stop brake pedal slowly sinks to floor. First noticed around 40,000 miles, inspected by team kia el cajon at 41,500 miles. Not dash lights associated. Brakes losing pressure is a major safety issue. Kia dealership had car over 30 days replaced brake master cylinder, booster and abs unit. Returned vehicle with same issue claimed normal operation.

For breaks: at 20k miles the steering wheel shakes like crazy when braking, and also the pedals: the rotors are very cheap for being a 0-mile purchase vehicle and Kia does not replace this under warranty. I saw a forum that this is an issue for all owners of this Kia K5 and Kia doesn't care and does not replace them. For Electrical issue: the fuse box melted a couple fuse because I used my rear defrost system. Kia extended the warranty for the HVAC motor fan only because was burning the fuses, but they did not wanted to replace my issue with the rear defrost because I was above 60k for only 1000 miles. This is a poor-quality system, Kia does not recognize it. This is a safety issue because 1. There is an electrical issue with a melted fuse box. Im driving around a car like this with 2 kids. 2. I don't have rear defrost working and I live in Chicago (wild winter). They want to charge +$6000 to repair the fuse box.

While driving on my way home from work my , brakes became extremely hard to press down on and then my service engine light came on this all occurred on 7/31/2024. So the very next day I took my vehicle to a Kia dealership which was 8/1/ 2024 to find out what was causing this to happen. The technician stated that they would have to put it on a machine and run a diagnostic on it. I asked the technician while they were doing that to change the oil. I also realized that the oil light for my vehicle has NEVER came on since I purchased the car. So the technician did the diagnostic and stated that my vacuum pump had went out but he couldn’t tell me why or how this had happened. I then took the vehicle to my parents house and left it there in the garage for a few weeks to have second opinion done. I then took it to another Kia dealership and they stated there was no vacuum to the brake booster and said there was a broken camshaft and metal pieces were in the engine and the engine needed to be replaced. Again I asked what caused all of this and no one could give me an answer. I had only had the car a 1 1/2 years and don’t understand what caused all of this and I now have a car that I can no longer drive.

My vehicle is a 2021 Kia K5 GT (2.5L-T), mechanically identical to Hyundai Sonata N-Line (2.5L-T). My car has 24000 miles on it and I have replaced the rotors on my car five times now due to premature warping. KIA OEM rotors, R1 Concepts, Brakenetic Rotors, all have warped. This issue is discussed amongst GT and N-Line owners heavily in the forums stating how the OEM Brake system has some sort of issue that causes premature rotor warp. Some have even resorted to changing their brake system to a old model Cadillac CTS-V system because of how crap these brakes are. Again after less than 2 months with new rotors, they have warped yet again.

While driving on 7/6/2022, upon acceleration, the vehicle began jerking and applying the brakes as if it was trying to attempt to avoid a rear end collision. Moments after that incident, the instrument cluster displayed warning lights of the following: check forward safety system, traction control, front end collision avoidance, electronic parking brake, and auto hold all in an orange color followed by a check engine light shortly after. Safety was put at risk due to the vehicle suddenly and uncontrollably braking without any warning on prior indication. The vehicle has not been inspected by anyone yet, but is schedule for a dealer diagnostic on August 9th, 2022. Currently, this vehicle has 10,900 miles on the odometer.