Other information:
Hyundai Sonata LF 2014-2019 Service Manual: Master Cylinder Repair procedures
Removal
1.
Turn ignition switch OFF and disconnect the negative (-) battery cable.
2.
Remove the air cleaner assembly (A).
3.
Disconnect the brake fluid level switch connector (A).
4.
Remove the brake fluid from the master cylinder reservoir with a syringe.
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Hyundai Sonata LF 2014-2019 Owners Manual: Brake Fluid
Checking the Brake Fluid Level
Check the fluid level in the reservoir periodically. The fluid level should be
between MAX and MIN marks on the side of the reservoir.
Before removing the reservoir cap and adding brake fluid, clean the area around
the reservoir cap thoroughly to prevent brake fluid ...