2014-2020 Mitsubishi Outlander Brake Fluid Type and Flush Interval

By Core Brake Parts Tech Team — Circleville, OH warehouse

The 2014-2020 Mitsubishi Outlander uses DOT3 or DOT4 glycol-based brake fluid from a sealed container, and Mitsubishi's U.S. maintenance schedule says to change it every 45,000 miles or 36 months, whichever comes first. That interval is the same on both of Mitsubishi's schedules, severe or normal, so there is no stretching it for easy highway driving. Below is what the factory literature actually says, which fluid to buy, and how to do the flush without letting air into the system.

What Mitsubishi Specifies for the Third-Generation Outlander

The 2015 Outlander owner's manual, in its maintenance specifications, states that the car takes brake fluid conforming to DOT3 or DOT4, poured from a sealed container. The same page makes three other points worth knowing before you open the hood:

• The fluid level lives between the MAX and MIN marks on the translucent reservoir mounted on top of the master cylinder.
• The brake warning lamp is also a low-fluid lamp. When the level drops below MIN, the brake fluid warning lamp on the instrument cluster lights.
• Brake fluid is hygroscopic. Mitsubishi warns that too much moisture in the fluid reduces brake system performance. That single fact is the reason the fluid has a replacement interval at all.

Mitsubishi also notes that the brake and clutch fluid share one reservoir on versions with a manual clutch. On an automatic Outlander, the reservoir feeds the brakes only.

One naming trap: the Outlander Sport is a different, smaller vehicle with its own maintenance entries. Mitsubishi's booklets list the brake fluid change as applying to every model except the Outlander Sport, so do not use this article's interval for a Sport. The Outlander PHEV plug-in hybrid is covered by a separate plug-in hybrid warranty and maintenance booklet; check that booklet for the PHEV.

The Flush Interval: 45,000 Miles or 36 Months

Mitsubishi's U.S. Warranty and Maintenance Manuals for gasoline models split service into two schedules. Schedule 1 is for severe use, which Mitsubishi defines to include dusty, rough, muddy or salt-spread roads, towing, extensive idling, repeated short trips in freezing weather, extended use of the brakes, sandy areas, and heavy city traffic in heat above 90 F. Schedule 2 is for everything else.

In both the 2016 and 2019 model-year booklets, the line "Change brake fluid" carries a mark at the 45,000, 90,000 and 135,000-mile columns on both schedules. Those columns correspond to 36, 72 and 108 months. The rule is mileage or time, whichever occurs first.

The time limit matters more than most owners think. A low-mileage Outlander that sits in a humid garage still pulls moisture through the reservoir vent and the rubber hoses. If your 2017 has only 25,000 miles on it but has never had a fluid change, it is already past the 36-month mark.

DOT3 vs DOT4: Which One to Buy

Both are allowed, and both are glycol-ether fluids that mix chemically. The difference is heat tolerance. Federal Motor Vehicle Safety Standard 116 sets these minimum boiling points:

"Wet" is the boiling point after the fluid has absorbed moisture, which is where a fluid that is several years old actually sits. When fluid boils in a hot caliper it makes vapor, and vapor compresses, so the pedal goes soft right when you need it. DOT4's higher wet floor gives more margin if you tow with a V6 Outlander, drive mountain grades, or live somewhere humid. For a daily-driven four-cylinder, a quality DOT3 meets the spec.

Do not use DOT5. FMVSS 116 requires silicone-based DOT5 to be dyed purple so it cannot be confused with glycol fluids, and it is not what Mitsubishi lists for this car. Also avoid mixing brands where you can: the older Outlander manuals warn that different brands use different additives. The simplest way to honor that is a full flush with one brand, not topping off a tired system with something else.

Signs Your Outlander Needs Fluid Now

• The brake warning lamp is on with the parking brake released. Check the reservoir level first. A low level usually means worn pads (the caliper pistons have moved out and taken fluid with them) or a leak.
• A soft or sinking pedal, especially after repeated stops coming down a hill. That is the classic symptom of moisture-laden fluid boiling.
• Dark fluid. FMVSS 116 requires new DOT3 and DOT4 to be colorless to amber. Fluid that looks like cola has been in there a long time. Color is a rough guide only; the calendar is the real rule.
• It has been 36 months since the last change, or you do not know when it was last done.

If the level is low, do not just top it off and move on. Look at pad thickness and check each wheel and the hoses for wet spots. Fluid does not get used up; it either went into the calipers as the pads wore or it leaked out.

How to Flush It Correctly

A brake fluid change on the Outlander is a two-person driveway job or a one-person job with a pressure bleeder. The basic sequence:

1. Remove old fluid from the reservoir with a clean suction tool, then refill to MAX with fresh fluid from a newly opened, sealed bottle.
2. Bleed each wheel in the sequence given in the factory service manual, pushing fluid through until it comes out clean and bubble-free. Keep the reservoir from ever dropping below MIN, or you will pull air into the master cylinder.
3. Tighten the bleeder screws to the factory service manual value. They are small and strip easily.
4. Set the final level between MIN and MAX, then test the pedal with the engine running before you drive. It should be firm and high.

Every 2014-2020 Outlander has ABS and stability control. A normal pressure or two-person bleed replaces the fluid in the lines and calipers. If air got into the system, for instance because the reservoir ran dry or the master cylinder was replaced, the hydraulic unit may need a scan-tool assisted bleed, which is a shop job. Brake fluid also strips paint, so cover the fender and rinse any drips with water right away.

What to Replace at the Same Time

Because the fluid is on a 36-month clock, a flush often lines up with a pad job. If you are in there, it is the right time to look at:

• Pads and rotors. Mitsubishi schedules a pad and rotor inspection every 7,500 miles on Schedule 1. We carry Bendix front ceramic brake pads for the 2014-2020 Outlander, plus a wider range in our brake pad collection and brake rotor collection.
• Bleeder screws and caliper hardware. A seized bleeder is common on salt-belt cars. Fresh brake hardware kits keep new pads sliding freely.
• Brake hoses. Mitsubishi calls for a hose check every 15,000 miles. A cracked or bulging hose should be replaced before you flush; see our brake hoses.
• Calipers if a piston is sticking or a boot is torn. Our brake calipers are the place to start.

Frequently Asked Questions

Can I use DOT4 in my Outlander if it has DOT3 now?

Yes. The owner's manual lists either DOT3 or DOT4, and both are glycol-based. For best results, do a full flush to a single fluid rather than topping up with a different one.

Is the interval different if I tow?

No. Towing puts you on Schedule 1, but both schedules call for a brake fluid change at 45,000 miles or 36 months. Towing does shorten the pad and rotor inspection interval, and it is a good reason to choose DOT4.

Does the Outlander Sport use the same schedule?

No. The Outlander Sport is a different model, and Mitsubishi's booklets list it separately from the brake fluid change entry. Check the Sport's own warranty and maintenance manual.

Why did my brake warning light come on when the fluid looks fine?

First confirm the parking brake is fully released. If it is and the level sits near MIN, worn pads are the usual reason. If the level is at MAX and the light stays on, have the system scanned; it can also flag an ABS or brake system fault.

How long does a brake fluid flush take?

For a shop with a pressure bleeder it is usually a short job. At home with a helper, plan on an afternoon the first time, most of which is getting the car safely on stands and the wheels off.

Sources

1. 2015 Mitsubishi Outlander Owner's Manual, Brake Fluid specifications - DOT3 or DOT4 from a sealed container, MAX/MIN marks, low-fluid warning lamp, hygroscopic warning, shared reservoir
2. Mitsubishi 2016 Warranty and Maintenance Manual - brake fluid change at 45,000/90,000/135,000 miles on both schedules; pad, rotor and hose inspection intervals
3. Mitsubishi 2019 Warranty and Maintenance Manual - Schedule 1 and 2 definitions, same brake fluid interval, Outlander Sport exception
4. 49 CFR 571.116, FMVSS 116 Motor Vehicle Brake Fluids - DOT3/DOT4/DOT5 dry and wet boiling point minimums, color requirements