2010-2017 GMC Terrain Brake Job Guide: Symptoms, Costs and the Right Parts

By Core Brake Parts Tech Team — Circleville, OH warehouse

A brake job on a 2010-2017 GMC Terrain means new pads, and usually new rotors, on one axle at a time. Every first-generation Terrain has disc brakes at all four corners, the pads carry built-in squealers that tell you when they are worn out, and the rear rotors hide a small drum-style parking brake inside them. Here is what wears, how to tell it is time, and what to buy so the job only has to be done once.

How the brakes work on a first-generation Terrain

GMC's owner manual is direct about it: the vehicle has disc brakes, front and rear. Each corner has a sliding caliper that squeezes two pads against a rotor. The front brakes do most of the stopping on any SUV because weight shifts forward under braking, so the front pads almost always wear out first. The rear pads last longer but are not lifetime parts.

The detail that surprises people on the rear axle is the parking brake. The Terrain does not use the rear caliper to hold the vehicle. Instead, it uses a drum-in-hat design: a small pair of parking brake shoes sits inside the center "hat" of each rear rotor and expands against it when you set the brake. On the 2013 model the parking brake is applied with a foot pedal, and releasing it means holding the service brake, then pressing the parking brake pedal momentarily until it lets go.

The hydraulic side is simple. The master cylinder reservoir is filled with DOT 3 brake fluid, which is marked on the reservoir cap. GM says to use only new DOT 3 from a sealed container, and warns that even a few drops of mineral-based oil (engine oil, for example) in the system can damage hydraulic parts badly enough that they have to be replaced.

Symptoms that your Terrain is due

• A high-pitched squeal while driving. GM builds wear indicators into the pads. When the friction material gets thin, the indicator makes a high-pitched warning sound. The manual notes the sound can come and go, and it often stops when you press the pedal firmly. That squeal is your cue to book the job soon.
• Grinding. If the squeal is ignored, the pad backing plate starts cutting into the rotor. At that point the rotors are almost always scrap, which is exactly what the manual means when it warns that driving on worn-out pads could result in costly brake repair.
• Pulsation in the pedal or steering wheel. Usually uneven rotor thickness or deposits on the rotor. GM specifically points to wheel nuts that were not tightened evenly and to specification as a cause of pulsation and rotor damage.
• A pedal that sinks further than it used to. The manual tells owners to see a dealer if the pedal does not return to normal height or if pedal travel increases rapidly. That can be worn pads, air or moisture in the fluid, or a hydraulic leak.
• The red brake warning light. With the parking brake fully released, this light comes on when the fluid level is low. Low fluid is either worn pads (the pistons sit further out and hold more fluid) or a leak.
• A weak parking brake. If the vehicle creeps on a slope with the parking brake set, the shoes inside the rear rotors may be worn, glazed, or out of adjustment.

One thing that is not a symptom: a light squeal on the first few stops of a damp or cold morning. GM notes that some driving conditions and climates cause a squeal when the brakes are first or lightly applied, and that it does not mean something is wrong.

Front vs rear brake job on the Terrain

The rear job is a little more involved only because of the parking brake. With the rotor off you can see the shoes, springs and adjuster. If the shoes are thin, soaked with grease, or the hardware is rusted, this is the time to replace them, because they cannot be inspected without pulling the rotor again. On reassembly the adjuster wheel is set so the shoes just barely touch the drum surface when the rotor is turned by hand.

What to replace together

GM's rule is short: brake linings should always be replaced as complete axle sets. Never do just one side. Beyond that, a good Terrain brake job usually includes:

• Pads for the whole axle. Ceramic pads are the common choice for a daily-driven crossover because they run quiet and keep wheels cleaner. Browse ceramic brake pads or the full brake pad range.
• Rotors, if they are grooved, below minimum thickness, or causing pulsation. Many Terrains reach their first pad change with rotors close to the discard limit stamped on the rotor itself. New brake rotors let the new pads bed in evenly and remove the most common cause of pulsation.
• Hardware. The clips the pads slide on lose their spring and corrode. A fresh brake hardware kit and properly greased caliper slide pins prevent the uneven wear and noise that make a new brake job feel old within months.
• Rear parking brake shoes, if worn. See our brake shoes for replacements.
• Calipers, only if needed. A seized slide pin, a torn piston boot, or a leak means a replacement caliper. A vehicle that pulls to one side, or one pad worn much more than its partner, is a strong hint.

If you would rather buy everything in one box, a matched front and rear pad-and-rotor kit such as those from Power Stop takes the guesswork out of fitment.

About the fluid: the manual tells owners not to top off the reservoir between services, because the level drops naturally as the pads wear and rises again when new, thicker pads push the pistons back. If fluid was added while the pads were worn, watch the reservoir as you push the pistons back so it does not overflow. Brake fluid damages paint, so wash off any spill right away.

How hard is the job, and what drives the cost

For someone with basic tools, a jack, stands and a torque wrench, a Terrain pad-and-rotor job is a moderate DIY job per axle. The front is the easier of the two. The rear adds the parking brake shoes and can take longer if the rotor is rusted to the hub or the shoes have worn a ridge into the drum surface.

The price of a brake job comes down to a few choices:

• Pads only vs pads and rotors. Pads alone are the cheapest route, but only if the rotors are still smooth and within thickness. Adding rotors raises the parts cost but usually gives the best result.
• One axle vs both. Doing both axles at once costs more that day but saves a second visit, and the rear is often not far behind the front.
• Parts vs labor. At a shop, labor is a large share of the bill, and the rear axle takes more time than the front because of the parking brake. Doing it yourself turns most of the bill into parts.
• Extras. Hardware kits, parking brake shoes, a caliper, or a fluid flush each add to the total. They are worth it when the old parts are worn, not as automatic add-ons.

Whoever does the work, the wheels must go back on correctly. The owner manual lists the wheel nut torque for the Terrain as 140 lb ft, tightened evenly in a crisscross sequence with a torque wrench. Running the nuts on unevenly with an impact gun is a well-known way to cause pulsation on brand-new rotors. Bed the new pads in afterward with a series of moderate stops before any hard braking.

On recalls: an NHTSA recall search by model year for the 2010-2017 Terrain did not show any campaigns filed against the brake system itself, but recalls are tracked by VIN, so run yours through NHTSA before any repair.

Frequently Asked Questions

Does the 2010-2017 GMC Terrain have rear disc brakes or drums?

Rear discs. The owner manual states the vehicle has disc brakes, and the only drum-style part is the small parking brake shoe set that lives inside the center of each rear rotor.

What brake fluid does the GMC Terrain use?

DOT 3. GM specifies new DOT 3 brake fluid from a sealed container, and the type is also marked on the master cylinder reservoir cap.

Why are my Terrain brakes squealing?

A steady high-pitched squeal while driving is usually the built-in wear indicator telling you the pads are worn. A brief squeal on the first stops of a cold or wet morning is normal and not a fault.

Do I need to replace rotors every time I change pads?

No, but they should be measured. If the rotors are grooved, below the minimum thickness stamped on them, or cause pulsation, replace them with the pads. Smooth rotors within spec can be reused.

Should I replace the parking brake shoes during a rear brake job?

Inspect them whenever the rear rotors are off. Replace them if they are thin, contaminated with grease or fluid, or if the parking brake no longer holds the vehicle on a slope.

What is the lug nut torque for a GMC Terrain?

The owner manual lists 140 lb ft for the original wheel nuts. Tighten them in a crisscross sequence with a torque wrench.

Sources

1. 2013 GMC Terrain Owner Manual (GM) - disc brakes front and rear, pad wear indicators, axle-set replacement, DOT 3 fluid, foot-operated parking brake, 140 lb ft wheel nut torque
2. 1A Auto: Replace Rear Parking Brake Shoes, 2010-14 GMC Terrain - drum-in-hat parking brake inside the rear rotor, removal order, adjuster setting
3. NHTSA Recalls - VIN recall lookup; model-year search shows no brake-system recalls for the 2010-2017 Terrain