Your vehicle has power-assisted brakes that adjust automatically through normal usage.
In the event that the power-assisted brakes lose power because of a stalled engine or some other reason, you can still stop your vehicle by applying greater force to the brake pedal than you normally would. The stopping distance, however, will be longer.
When the engine is not running, the reserve brake power is partially depleted each time the brake pedal is applied. Do not pump the brake pedal when the power assist has been interrupted. Pump the brake pedal only when necessary to maintain steering control on slippery surfaces.
WARNING - Brakes
Kia Cee'd JD Service Manual: Battery Description and operation
Description
1.
The MF(Maintenance Free) battery is, as the name implies, totally maintenance
free and has no removable battery cell caps.
2.
The MF(Maintenance Free) battery does not require water replenishment
for the repair.
...
Kia Cee'd JD Service Manual: Troubleshooting
Engine Overheat Troubleshooting
Inspection
Remedy
Visual inspection
Inspect for shortage of coolant in reservoir tank .
Reinspect after replenishing coolant.
Inspect for coolant pollution after ...