I'd get a code reader and see if you can pull any codes or data from the OBDII. Maybe the dealer can run diagnostics on the ABS system. Could be a malfunction that isn't bringing up fault light on the dash. My Chevy Colorado started throwing ABS fault on the dash light. OBD reader said faulty sensor rotor /sensor on drivers side front wheel. I changed the hub with reluctor and I changed the sensor. Truck was pulling to the right under hard braking. Changed components mentioned and cleared the code. It fixed it. If the dealer won't run diagnostics, you might be able to get a loaner code reader from the big box part stores for free. Below is link to KIA Forte forum...
https://www.forteforums.com/threads/...l-codes.11832/
ABS Codes listed here. Chassis codes begin with a "C"
https://fdocuments.in/document/dtc-20-faq-kia.html