2015-2016 Chevrolet Colorado Brake Fluid Type and Flush Interval

By Core Brake Parts Tech Team — Circleville, OH warehouse

The 2015 and 2016 Chevrolet Colorado takes DOT 3 brake fluid, the same fluid printed on the master cylinder reservoir cap and listed in the owner's manual as GM Part No. 19299818 (19299819 in Canada). GM's maintenance schedule calls for replacing the brake fluid every 45,000 miles or every three years, whichever comes first. Below is what that means in practice, how to check the fluid, and what else to look at while the system is open.

What Brake Fluid Does the 2015-2016 Colorado Use?

Both the 2015 and 2016 Colorado owner's manuals state that the brake master cylinder reservoir is filled with DOT 3 brake fluid, and both list "DOT 3 Hydraulic Brake Fluid" in the Recommended Fluids and Lubricants table for the hydraulic brake system. The 2016 manual adds that you should use only GM approved DOT 3 fluid from a clean, sealed container. On trucks with a manual transmission, the hydraulic clutch uses the same DOT 3 fluid, and the 2016 manual describes a common brake/clutch reservoir.

DOT 3 is a federal standard, not a brand. FMVSS No. 116 sets the minimum boiling points a fluid must meet to carry each rating:

The "wet" number is the boiling point after the fluid has absorbed moisture, and it is the one that matters on an older truck. That drop from dry to wet is the whole reason GM puts brake fluid on a time-and-mileage schedule.

Can you use DOT 4? DOT 4 is also glycol-based and has higher minimum boiling points, so many shops treat it as an acceptable upgrade in a DOT 3 system. GM's own instruction for this truck is DOT 3, so if you want to stay by the book, buy DOT 3. Never use DOT 5 silicone fluid in a Colorado. The standard requires it to be labeled "DOT 5 SILICONE BASE" and colored purple so it cannot be confused with glycol fluids, and it does not mix with the fluid already in the system. The 2015 manual also warns that just a few drops of mineral-based oil, such as engine oil, can damage brake hydraulic parts badly enough that they must be replaced.

Brake Fluid Flush Interval: 45,000 Miles or 3 Years

In the Colorado maintenance schedule, "Replace brake fluid" is checked at 45,000, 90,000 and 135,000 miles, with a footnote that reads "or every three years, whichever comes first." That same interval appears in the Normal and Severe service schedules in both the 2015 and 2016 manuals. Replace clutch fluid is listed on the same interval for manual-transmission trucks.

For a 2015 or 2016 Colorado today, the three-year clock almost always runs out long before the mileage does. A truck that has never had a fluid change is likely well past its first two or three due dates on time alone, even if it has low miles.

The manual explains why: brake fluid absorbs water over time, and replacing it on schedule prevents increased stopping distance. Water lowers the boiling point, so on a long downhill or while towing, the fluid in the calipers can boil, form vapor, and give you a soft pedal that goes toward the floor. Moisture also promotes internal corrosion in calipers, lines and the ABS hydraulic unit.

How to Check the Brake Fluid Level

1. Park on level ground with the engine off and locate the brake fluid reservoir on top of the master cylinder (the Engine Compartment Overview in the owner's manual shows where). The cap is marked with the fluid type.
2. Look at the fluid level through the translucent reservoir. It should sit above the MIN mark and, after brake work, not above the MAX mark.
3. Look at the color. Fresh DOT 3 is clear to light amber. Dark brown or cloudy fluid is old and due for replacement regardless of the level.
4. Wipe the cap and the area around it before you ever open it, so dirt cannot fall into the reservoir.

GM is specific about topping off: do not do it. The fluid level drops for only two reasons, normal pad wear or a leak. As the pads wear, the caliper pistons move out and fluid follows them, so a slightly low level on a truck with worn pads is expected. If you top it off and then install new pads, the pistons push that fluid back and the reservoir overflows. A low level with healthy pads means a leak, and adding fluid does not fix a leak. When the level falls far enough, the brake system warning light comes on and the Driver Information Center can show a BRAKE FLUID LOW message.

Symptoms Your Colorado Needs Brake Fluid Service

• Soft or spongy pedal, or a pedal that sinks further than it used to. The manual says to see a technician if pedal travel increases rapidly.
• Pedal fade on long grades or while towing, which points to moisture-laden fluid boiling in the calipers.
• Dark, murky fluid in the reservoir.
• Brake warning light or BRAKE FLUID LOW message, which calls for a leak inspection, not just more fluid.
• Wet spots on the inside of a wheel or drips near a tire.

That last one has a history on this truck. GM recall 15V-278 (GM bulletin 14888) covered certain 2015 Colorado and Canyon trucks whose front brake calipers could leak fluid through tiny air pockets in the cast caliper body. GM said owners might find brake fluid on the ground by a front tire, with longer pedal travel and a warning light if enough fluid was lost. Dealers inspected the caliper casting and replaced the front calipers if needed, refilling with DOT 3 fluid. If you own a 2015 Colorado, run the VIN on the NHTSA recall lookup to confirm the work was done.

Doing the Flush: What It Involves

A brake fluid replacement means pushing new fluid through every line until clean fluid comes out of all four bleeder screws. The 2015-2016 Colorado uses four-wheel disc brakes, so you are bleeding four calipers, not wheel cylinders. The basic approach:

1. Remove as much old fluid from the reservoir as you can with a clean syringe, then refill with fresh DOT 3 from a sealed bottle.
2. Bleed each caliper in the sequence given in GM service information, keeping the reservoir from ever running low so air cannot enter the master cylinder.
3. Continue at each wheel until the fluid coming out is clear and free of bubbles.
4. Tighten bleeder screws to the value in the factory service manual, set the level between MIN and MAX, and confirm a firm pedal before driving.

Two-person pedal bleeding, a pressure bleeder or a vacuum bleeder all work for a routine exchange where air has not entered the system. If the reservoir was run dry or the master cylinder or ABS unit was replaced, check the service information for whether a scan-tool bleed procedure is required. Wash off any spilled fluid right away, because DOT 3 damages paint. For a driveway mechanic with basic hand tools and a helper, a flush is a moderate job that fits in a morning.

What to Inspect or Replace at the Same Time

With the wheels off, it is the right moment to look at everything the fluid touches. GM's brake inspection item covers the lines and hoses for leaks, cracks and chafing, the pads for wear, the rotors for surface condition, and the calipers.

• Pads: the Colorado's disc pads have built-in wear indicators that squeal when they are worn. Replace them as complete axle sets, and do it before the flush so the reservoir level ends up correct. Browse brake pads for your truck or quieter ceramic brake pads.
• Rotors: check for scoring, heat spots or pulsation. For the 2.5L Colorado we carry the EBC GD Sport slotted and drilled front rotors and the EBC 3GD slotted rear rotor set. Other options are in our brake rotor collection.
• Hoses: rubber flex hoses at each wheel age and crack. Replace any that bulge or weep with new brake hoses.
• Calipers: a caliper with a torn boot, stuck piston or seeping seal should be replaced now, since you are bleeding the system anyway. See our brake calipers.

Frequently Asked Questions

What type of brake fluid does a 2016 Chevy Colorado take?

DOT 3 hydraulic brake fluid, listed in the owner's manual as GM Part No. 19299818 (19299819 in Canada). The same fluid is used for the 2015 model year and for the hydraulic clutch on manual-transmission trucks.

How often should I change the brake fluid on a 2015 Colorado?

GM calls for replacing it every 45,000 miles or every three years, whichever comes first. For most trucks of this age the three-year limit is the one that applies.

Can I put DOT 4 in my Colorado?

DOT 4 is glycol-based and meets higher minimum boiling points than DOT 3, so it is generally compatible, but GM specifies DOT 3 for this truck. Never use DOT 5 silicone fluid.

Why is my Colorado brake fluid low?

Either the pads are worn, which lets the fluid level drop as the caliper pistons extend, or there is a leak. If the pads are healthy and the level is low, have the system inspected instead of adding fluid.

Is brake fluid replacement really necessary if the brakes feel fine?

Yes. Fluid absorbs moisture gradually, so the pedal can feel normal in daily driving while the boiling point has already dropped. The problem shows up under heavy use, such as towing or long descents, which is the worst time to find it.

Sources

1. 2016 Chevrolet Colorado Owner's Manual - DOT 3 fluid, GM part number, 45,000 mile or 3-year interval, fluid checking and topping-off guidance, BRAKE FLUID LOW message
2. 2015 Chevrolet Colorado Owner's Manual (GM) - DOT 3 fluid, maintenance interval, mineral oil warning, pad wear indicators
3. 49 CFR 571.116 - FMVSS No. 116 Motor Vehicle Brake Fluids - DOT 3, DOT 4 and DOT 5 minimum boiling points and silicone labeling and color
4. NHTSA - GM Recall Bulletin 14888D (15V-278) - 2015 Colorado front caliper leak condition and repair
5. Clean Fleet Report - First Drive: 2015 Chevrolet Colorado and GMC Canyon - standard four-wheel disc brakes