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

Kia Optima DL3 2019-2021 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 2019-2021 Service and Repair Manual: Positive Crankcase Ventilation (PCV) Valve


Description and operation Operation Principle Repair procedures Removal 1. Disconnect the vapor hose (A). 2. Remove the PCV valve (B). Tightening torque : 1.96 - 2.94 N.m (0.2 - 0.3 kgf.m, 1.45 - 2.17 ...

Kia Optima DL3 2019-2021 Owner's Manual: Warning Messages


Shift to P position (for smart key system) This warning message illuminates if you try to turn off the engine without the shift lever in P (Park) position. At this time, the Engine Start/Stop Button turns to the ACC position (If you press the Engine Start/Stop Button once more, it will t ...

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