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:
Hyundai Elantra AD (2016-2020) Owners Manual: Special Driving Conditions
Hazardous Driving Conditions
When hazardous driving elements are encountered such as water, snow, ice, mud
and sand, take the below suggestions:
Drive cautiously and keep a longer braking distance.
Avoid abrupt braking or steering.
When your vehicle is stuck in snow, mud, or sand, use sec ...
Hyundai Elantra AD (2016-2020) Service Manual: Flow Diagram
Power Flow Chart
P,NUD/BLR/B26/B35R/COD/COWC?
? Direction of Rotation
?Lower & Reverse Brake (LR/B) Activation > Overdrive (O/D) Hub Lock > Mid & Rear P/C Lock
?Input Shaft Rotation > Rear Sun Gear Rotation > Rear Inner
Pinion Rotation (Reverse) > Rear Outer Pinion Rotation > R ...