2019 Genesis G70 Brake Fluid Type and Flush Interval

By Core Brake Parts Tech Team — Circleville, OH warehouse

The 2019 Genesis G70 uses brake fluid that meets FMVSS 116 DOT 3 or DOT 4, and the owner's manual lists a capacity of about 0.7 to 0.8 liters. The 2019 manual only calls for the fluid to be inspected on a schedule, not replaced at a set mileage, but Genesis's later G70 manuals set a replacement every 48,000 miles or 48 months, and that is the sensible benchmark for a 2019 car that has never had a flush.

What Brake Fluid the 2019 G70 Takes

The Recommended Lubricants and Capacities table in the 2019 G70 owner's manual lists the brake/clutch fluid as FMVSS116 DOT-3 or DOT-4, with a volume of 0.74 to 0.85 US quarts (0.7 to 0.8 liters). The maintenance chapter repeats it: use only hydraulic brake fluid conforming to DOT 3 or DOT 4. The manual calls it "brake/clutch fluid" because the same specification covers the clutch hydraulics on cars built with a manual gearbox.

Genesis tightened the call-out on later cars. The 2024 G70 manual says to use only hydraulic brake fluid conforming to DOT 4. A DOT 4 fluid also meets the 2019 spec, so if you are buying fluid today, a fresh sealed bottle of DOT 4 is the easy choice for this car.

Do not put DOT 5 in this car. The federal standard treats DOT 5 as a silicone-based fluid dyed purple, while DOT 3, DOT 4 and DOT 5.1 are non-silicone fluids that run colorless to amber. Motul's technical data sheet states that DOT 3, DOT 4 and DOT 5.1 non-silicone fluids can be mixed with each other, but silicone DOT 5 and mineral fluids must not be mixed in.

DOT 3 vs DOT 4: What the Numbers Mean

FMVSS 116 sets minimum boiling points for each grade. The dry figure is for fresh fluid; the wet figure is for the same fluid after it has absorbed moisture. Wet is the number that matters on a car that has been on the road a few years.

DOT 4 gives you more margin before the fluid boils in the calipers, and that margin matters on a G70. Some cars were built with the High Performance Brake option, which the owner's manual describes as large-diameter Brembo brakes. Big brakes shed heat well, but hard driving, long mountain descents and track days still push heat into the fluid, and boiled fluid is what produces a soft pedal that sinks toward the floor.

Why the Fluid Wears Out Even When the Level Looks Fine

This type of brake fluid pulls moisture out of the air over time. Motul's data sheet explains that DOT 3, DOT 4 and DOT 5.1 fluids absorb humidity, which lowers their boiling point, and notes that the wet boiling point is representative of fluid after one year of use. Federal labeling rules make every bottle carry the same warning: keep brake fluid clean and dry, and keep the container tightly closed to prevent absorption of moisture.

That is why a full reservoir tells you nothing about fluid condition. The level only tells you about pad wear and leaks. Signs the fluid itself is due:

• The fluid in the reservoir has turned from light amber to dark brown.
• The pedal feels softer or travels further after a long downhill or a hard drive, then firms up once things cool.
• A moisture test at the shop shows the fluid has absorbed water.
• You cannot find any record of a flush and the car is several years old.

Moisture in the lines also corrodes metal parts from the inside. The ABS hydraulic unit, caliper pistons and the master cylinder bore all sit in that fluid, and every one of them costs far more than a flush.

2019 G70 Flush Interval: What Genesis Actually Says

The 2019 normal maintenance schedule lists brake/clutch fluid as an inspect item every 12,000 miles or 24 months. It does not print a fixed replacement mileage. The owner maintenance list adds a brake fluid level check at least once a year.

The 2024 G70 manual is more specific: its schedule calls for inspecting the brake fluid every 12 months and replacing it every 48,000 miles or 48 months. The job the fluid does did not change between model years, so a 48-month change is a reasonable ceiling for a 2019 car too. Motul, as a fluid maker, recommends draining once a year for safety, which is closer to what performance and track owners do.

Put simply: every 2019 G70 is now well past four years old. If the fluid has never been changed, it is due now. If you drive hard, see a lot of mountain roads, or take the car to track days, change it more often and always before a track event.

How to Check the Level and Flush the System

The level should sit between the MIN and MAX marks on the side of the reservoir. The owner's manual adds points worth following exactly:

• Clean the area around the cap before you open it so dirt does not fall into the reservoir.
• Top up only to MAX. The level drops slowly as pads wear, which is normal. A level that keeps dropping points to a leak.
• Keep fluid off the paint; it will damage it.
• Never use fluid from a bottle that has been left open for a long time, since its quality cannot be guaranteed.
• A few drops of mineral oil, such as engine oil, can damage brake system parts.

A full flush pushes old fluid out of every caliper until clean fluid appears, so plan on buying more than the listed capacity. The G70 has ABS, electronic stability control and an electronic parking brake, so do not let the reservoir run dry during bleeding; pulling air into the hydraulic unit makes the job much harder. Many owners have a shop with a pressure bleeder and scan tool do it. Tighten bleeder screws to the value in the factory service manual rather than by feel.

What to Replace at the Same Time

A fluid flush is a good moment to look over the rest of the brake system, and the 2019 schedule lists front and rear discs, pads and calipers as inspect items at every service. If pads or rotors are near their limit, doing them with the flush saves a second bleed.

• For Brembo-equipped 2.0T cars, we carry the EBC Yellowstuff street and track front pads for the Brembo G70 2.0T and the matching EBC Yellowstuff rear pads, a good pairing with fresh DOT 4 if you drive hard.
• For daily driving on Brembo cars, the EBC Greenstuff 2000 sport front pads are a street-focused option.
• If the rotors are worn or grooved, the EBC BSD V-slot front rotor set for Brembo G70s fits the same cars.
• For 2.0T cars without the Brembo package, check the EBC Redstuff front pad set.

Confirm whether your car has the Brembo package before ordering, because the pads and rotors differ. You can also browse all brake pads and brake hoses; cracked or swollen rubber hoses are worth replacing while the system is open.

Frequently Asked Questions

Can I use DOT 3 in a 2019 Genesis G70?

Yes. The 2019 owner's manual lists FMVSS 116 DOT 3 or DOT 4. DOT 4 has higher minimum boiling points and is what Genesis specifies on later G70s, so it is the better pick.

How often should I flush the brake fluid on a 2019 G70?

The 2019 manual lists inspection every 12,000 miles or 24 months without a fixed change interval. Later G70 manuals call for replacement every 48,000 miles or 48 months, which is a sensible maximum. Change it sooner if you drive hard or track the car.

Can I mix DOT 3 and DOT 4?

Fluid maker Motul states that DOT 3, DOT 4 and DOT 5.1 non-silicone fluids are mixable, though flushing the whole system to one fluid is the cleaner job. Never add silicone DOT 5 or mineral fluid.

How much brake fluid does a 2019 G70 hold?

The owner's manual lists 0.74 to 0.85 US quarts (0.7 to 0.8 liters). Buy extra for a flush, since bleeding pushes fluid through every line.

Why does my brake pedal feel soft after a hard drive?

Moisture-laden fluid can boil in hot calipers and form vapor, which compresses. Old fluid is a common cause; worn pads, air in the lines or a leak are others. Have it checked before driving hard again.

Is a dropping brake fluid level a problem?

A slow drop as pads wear is normal. If you have to add fluid often, the manual says that can indicate a leak and the system should be inspected.

Sources

1. Genesis 2019 G70 Owner's Manual - DOT 3 or DOT 4 spec, 0.7 to 0.8 L capacity, inspection schedule, level check warnings, High Performance Brake note
2. Genesis 2024 G70 Owner's Manual - DOT 4 specification and 48,000 mile / 48 month replacement interval on later G70s
3. 49 CFR 571.116, FMVSS No. 116 Motor Vehicle Brake Fluids (Cornell LII) - DOT 3 and DOT 4 dry and wet boiling points, fluid colors, container moisture warnings
4. Motul DOT 3&4 Technical Data Sheet - moisture absorption, wet boiling point after one year, mixing compatibility, yearly drain recommendation