Kia Optima: Brake system / Hill-start assist control (HAC)

Kia Optima DL3 2019-2020 Owner's Manual / Driving your vehicle / Brake system / Hill-start assist control (HAC)

A vehicle has the tendency to roll back on a steep hill when it starts to go after stopping. The Hill-start Assist Control (HAC) prevents the vehicle from rolling back by applying the brakes automatically for about 2 seconds. The brakes are released when the accelerator pedal is depressed or after about 2 seconds.

The HAC is activated only for about 2 seconds, so when the vehicle is starting off always depress the accelerator pedal.

WARNING - Maintaining Brake Pressure on Incline

HAC does not replace the need to apply brakes while stopped on an incline. While stopped, make sure you maintain brake pressure sufficient to prevent your vehicle from rolling backward and causing an accident. Don’t release the brake pedal until you are ready to accelerate forward.

Vehicle stability management (VSM)
This system provides further enhancements to vehicle stability and steering responses when a vehicle is driving on a slippery road or a vehicle detects changes in coefficient of friction between r ...

Good braking practices
Check to be sure the parking brake is not engaged and the parking brake indicator light is out before driving away. Driving through water may get the brakes wet. They can also get wet when ...

Other information:

Kia Optima DL3 2019-2020 Service and Repair Manual: Valve Body


Repair procedures Replacement    It is not recommended to replace the valve body . If the valve body needs to be replaced, the automatic transaxle assembly should be replaced and the oil pressure characteristics ...

Kia Optima DL3 2019-2020 Owner's Manual: Rocking the vehicle


If it is necessary to rock the vehicle to free it from snow, sand, or mud, first turn the steering wheel right and left to clear the area around your front wheels. Then, shift back and forth between R (Reverse) and any forward gear in vehicles equipped with an Automatic transmission. Do not ra ...

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