Your vehicle has power-assisted brakes that adjust automatically through normal usage.
If the engine is not running or is turned off while driving, the power assist for the brakes will not work. You can still stop your vehicle by applying greater force to the brake pedal than typical. The stopping distance, however, will be longer than with power brakes.
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
Take the following precautions:
Braking System
Disc Brakes Wear Indicator, Rear Drum BrakesHyundai Elantra AD (2016-2020) Service Manual: Description and Operation
Description
BSD is a system that uses two magnetic wave radar sensors
attached on the rear panel to measure the distance from the following
vehicles and provides the sensing and (visual and auditory) alarm of any
vehicle coming into the blind spot.
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Blind Spot Detection (BSD) : Senses o ...
Hyundai Elantra AD (2016-2020) Owners Manual: System Setting and Operation
System setting
To turn ON the Driver Attention Warning (DAW) system, turn on the engine,
and then select 'User Settings → Driver Assistance → Driver Attention Warning
→ High sensitivity/Normal sensitivity/Off'
The driver can select the mode of the Driver Attention Warning ( ...