2020-2023 Hyundai Palisade Brake Fluid Type and Flush Interval

By Core Brake Parts Tech Team — Circleville, OH warehouse

The 2020-2023 Hyundai Palisade uses DOT 4 brake fluid. The Recommended Lubricants and Capacities table in the owner's manual lists it as FMVSS116 DOT-4, with the quantity given only as "as required." For the flush interval, the 2022 manual says to inspect the fluid every 8,000 miles or 12 months at first, then replace it every 48,000 miles or 48 months. The 2020 manual lists brake fluid as an inspection item only, with no fixed replacement mileage, so on the early trucks a moisture test is what tells you when it is due.

What the Palisade Owner's Manual Actually Says

Hyundai gives the fluid spec in two places, and they read a little differently. The capacities table in chapter 8 names FMVSS116 DOT-4. The explanation of scheduled maintenance in chapter 7 says to use hydraulic brake fluid that conforms to DOT 3 or DOT 4. Both the 2020 and the 2022 manuals carry that same pair of statements. Our advice is simple: follow the capacities table and use DOT 4. It is the fluid named for this vehicle, and it has the higher boiling-point minimums under the federal standard.

We read the 2020 and 2022 manuals for this guide. If you own a 2021 or a 2023, look at the maintenance schedule in your own glovebox manual, because Hyundai revised the brake fluid line between those two years.

Why DOT 4 Matters: Boiling Points and Moisture

DOT 3 and DOT 4 are both glycol-ether fluids, and both are hygroscopic, which means they pull moisture out of the air. They pick it up through the reservoir cap vent, through rubber hoses, and every time the reservoir is opened. As water content rises, the boiling point falls.

Federal Motor Vehicle Safety Standard 116 sets the minimum boiling points each grade has to meet:

Brake manufacturer ADVICS defines the wet boiling point as the point at which the fluid boils after absorbing 3.7 percent water by volume. It also says DOT 4 formulas become saturated after about two years, compared with about one year for DOT 3. That is why a time limit matters as much as a mileage limit. A Palisade that sits in a humid garage and only covers a few thousand miles a year still collects moisture in its fluid.

Boiling fluid matters most on a vehicle this heavy. The Palisade is a three-row SUV that often carries a full load or pulls a trailer, and long downhill grades or repeated hard stops can push brake temperatures high enough to boil wet fluid. Once the fluid boils, you get vapor in the lines. Vapor compresses where liquid does not, so the pedal goes soft or sinks.

Symptoms Your Palisade's Brake Fluid Needs Attention

• Parking Brake and Brake Fluid warning light on with the parking brake released. The owner's manual says this means the fluid level in the reservoir is low. Hyundai tells you to stop somewhere safe, check the level with the engine off, top up, and check every brake component for leaks. If you find a leak, the light stays on, or the brakes do not work properly, do not drive the vehicle.
• ABS and brake warning lights on together. The manual warns that with both lamps lit, the brake system will not work normally, including the electronic brake-force distribution. Avoid high speeds and hard braking, and get the vehicle inspected as soon as possible.
• A spongy or sinking pedal, especially after long downhill braking. This fits boiled or aerated fluid.
• Dark, murky fluid in the reservoir. New DOT 4 is light amber. Dark or cloudy fluid has picked up moisture and contamination.
• A level that keeps dropping. Hyundai notes that the level falls slowly as the pads wear, and that is normal. Needing to add fluid often points to a leak.

How to Check and Top Up the Fluid

1. Park on level ground and turn the engine off. The reservoir sits on top of the master cylinder.
2. Read the level against the MIN and MAX marks on the side of the reservoir.
3. Before you open the cap, clean the area around it thoroughly. Hyundai calls for this to keep dirt out of the fluid.
4. If the level is low, add DOT 4 up to the MAX line. Use fluid from a sealed container. The manual says fluid that has been exposed to open air for a long time should never be used. FMVSS 116 also requires every bottle to say that the container should be kept tightly closed so the fluid does not absorb moisture.
5. Never let petroleum products near the system. Hyundai warns that a few drops of a mineral-based oil, such as engine oil, can damage brake system parts.
6. Wipe up any spill immediately, because brake fluid damages paint. If fluid gets in your eyes, flush them with clean water for at least 15 minutes and get medical attention.

Topping up is not the same as servicing the fluid. Adding new DOT 4 to old fluid dilutes the water, but the old fluid stays in the calipers and ABS unit. When the fluid is due, flush the whole system.

Flushing the Palisade: What Is Different About This SUV

The Palisade has disc brakes at all four wheels, ABS with electronic stability control, and an electronic parking brake (EPB). A full flush pushes new fluid through each caliper until clean fluid comes out of every bleeder. That process is normal, but a few points are specific to this vehicle:

• The ABS/ESC hydraulic unit holds fluid too. A pressure or vacuum bleed at the wheels moves most of the old fluid. If air gets into the unit, for example because the reservoir ran dry during the job, it may need a scan-tool bleed routine. Keep the reservoir topped up the whole time.
• The electronic parking brake needs care on rear pad jobs. If rear pads are part of the work, retract the EPB first using the service or maintenance mode the factory procedure calls for. Never force the pistons back.
• Bleed order and bleeder torque should come from the factory service information for your model year. We do not print a number here that we could not confirm.

For a DIYer with a helper or a pressure bleeder, a flush is a moderate job, and it also makes sense any time the hydraulics are opened. Plan it with a pad or caliper job so everything gets done in one visit.

What to Replace at the Same Time

A fluid flush is a good time to look over the rest of the system, because the wheels are already off and the bleeders are already open:

• Pads and rotors. The Palisade's pads have audible wear indicators. A high-pitched squeal from the front or rear while braking means the pads are near the end. Hyundai says to replace pads as complete front or rear axle sets. We carry 2020-2023 Palisade and Telluride front ceramic brake pads, and the full range is in our brake pads collection and brake rotors collection.
• Rubber brake hoses. Look for cracks, chafing, and swelling. Hyundai's schedule inspects the brake lines, hoses, and connections at every service. Replacement hoses are in our brake hoses collection.
• Calipers. If you see seepage around a piston boot or a sticking slide, replace the caliper now rather than bleeding the system twice. See our brake calipers.
• Hardware. New clips and slide-pin boots help prevent noise and uneven pad wear. Browse brake hardware kits.

Frequently Asked Questions

Can I use DOT 3 in my Hyundai Palisade?

The maintenance explanation in the manual allows DOT 3 or DOT 4, but the capacities table names FMVSS116 DOT-4. Use DOT 4. It has higher minimum dry and wet boiling points, which helps a heavy SUV that tows or carries full loads.

Can I use DOT 5.1 in a Palisade?

DOT 5.1 is a glycol-based fluid like DOT 3 and DOT 4, but it is not the fluid Hyundai lists. Staying with DOT 4 is the simplest way to match the factory specification. Never use silicone-based DOT 5 in a system designed for glycol fluid.

How much brake fluid does a Palisade hold?

Hyundai does not publish a fill capacity. The owner's manual lists the quantity as "as required." For a full flush, buy more than you think you will need, in sealed containers, so you never run the reservoir dry.

How often should I flush the brake fluid on a 2020 or 2021 Palisade?

The 2020 manual lists brake fluid as an inspection item and gives no fixed replacement mileage. The later 2022 schedule calls for replacement every 48,000 miles or 48 months after the initial inspections. Following the newer interval, or testing moisture content at each inspection, is a sensible approach for early trucks.

Why is my brake fluid light on when the parking brake is off?

On the Palisade, that light means the fluid level in the reservoir is low. Worn pads lower the level slowly. A sudden drop means a leak. Stop, check the level, look for leaks, and do not drive if the brakes do not feel right.

Sources

1. Hyundai 2022 Palisade Owner's Manual - FMVSS116 DOT-4 spec, 8,000-mile/12-month inspection and 48,000-mile/48-month replacement, warning light meaning, level-check and handling warnings, pad wear indicators, EPB
2. Hyundai 2020 Palisade Owner's Manual - DOT-4 spec and brake fluid listed as an inspection item on the 2020 schedule
3. 49 CFR 571.116 (FMVSS 116), Cornell LII - DOT 3 and DOT 4 minimum dry and wet boiling points, container moisture labeling
4. ADVICS - Brake Fluid Boiling Points - wet boiling point definition (3.7 percent water), DOT 4 saturation timeline, vapor lock