2016-2020 Kia Sorento Brake Caliper Problems and Replacement

By Core Brake Parts Tech Team — Circleville, OH warehouse

Caliper trouble on a 2016-2020 Kia Sorento usually shows up as a pull to one side, a hot or smelly wheel after a drive, or one pad worn far thinner than the others. On this generation the cause is almost always a sticking slide pin or a corroded piston rather than a factory defect. NHTSA lists no caliper recall for these model years, so the repair is normal maintenance: clean or replace the pins, or replace the caliper, and do the pads and rotors on that axle at the same time.

How the Sorento's Calipers Work

The third-generation Sorento (2016-2020) uses disc brakes at all four corners with floating calipers. A floating caliper has its piston on the inboard side only. When you press the pedal, hydraulic pressure pushes the piston against the inner pad, and the caliper body slides inward on two guide pins so the outer pad clamps the rotor from the other side. That sliding is the weak point. If the pins bind, the outer pad stops doing its share of the work and the inner pad wears fast.

Kia's own parts catalog lists the same front caliper kits (left 58180C6A00, right 58190C6A00) for 2015-2020 Sorentos with the 2.0L turbo, 2.4L and 3.3L V6 engines. In practice that means a front caliper does not change with engine choice in this generation, which keeps parts matching simple.

The rear is different in one useful way. On Sorentos equipped with the electronic parking brake (EPB), Kia's service information describes parking brake shoes that sit inside the hat of the rear rotor, adjusted through an access plug with a star wheel. The rear caliper handles normal braking; the parking brake is a separate drum-in-hat system. That matters when you replace rear calipers or pads, covered below.

Symptoms of a Bad Caliper on a Sorento

• Pulling while braking. One caliper applying weakly lets the other side win, so the SUV drifts toward the good side under braking.
• Pulling or drag while cruising. A piston that will not retract keeps the pad on the rotor. The vehicle can feel sluggish, as if the parking brake were partly on.
• One hot wheel and a burning smell. After a drive, a dragging brake is noticeably hotter than the other side, and the wheel may be coated in more dust.
• Uneven pad wear. An inner pad worn to the backing plate while the outer pad is still thick is the classic seized-slide-pin pattern.
• Fluid on the inside of the wheel or a dropping reservoir. A torn piston seal or a leaking bleeder lets fluid out. A spongy pedal and a low-fluid warning follow. Treat any external brake fluid leak as a stop-driving problem.

Diagnosing Piston vs. Slide Pin Problems

You can usually tell which part has failed before you spend money.

A quick check: lift the corner, spin the wheel by hand and compare it to the other side. A brake that drags noticeably after the pedal is released has a problem. With the pads out, you should be able to push the caliper body back and forth on its pins by hand. If it will not slide, the pins are the issue.

What Causes Caliper Failure

Corrosion is behind most failures. Haynes points to inactivity combined with corrosion as the main reason brakes seize, and Sorentos driven on salted winter roads see plenty of it. The chain usually looks like this:

• A dust boot on the piston or a slide pin tears, and water gets in.
• The pin or piston rusts in its bore and stops moving freely.
• Old brake fluid, which absorbs moisture over time, corrodes the caliper from the inside.
• Petroleum-based grease on the pins swells the rubber boots, which then bind or split. Use only brake-specific grease that is safe for rubber.

Regular brake fluid changes on the interval in your Sorento's maintenance schedule do more to protect calipers than anything else, because they remove the moisture that attacks pistons and seals.

Replacing a Caliper: What to Replace With It

Calipers are best replaced in axle pairs. A new caliper on one side and a tired one on the other gives uneven clamping force, which brings back the pull you were trying to fix. If you are replacing a caliper, it is also the right time to:

• Replace the pads on that axle. Pads that ran against a dragging caliper are usually glazed or tapered.
• Replace or measure the rotors. A dragging brake overheats the rotor and can leave hard spots and thickness variation, which you will feel as pedal pulsation.
• Fit new hardware. Abutment clips and pin boots are inexpensive and are a common cause of repeat noise and sticking. See our brake hardware kits.
• Inspect the flex hose. An internally collapsed hose can act like a stuck caliper by holding pressure. Replacement brake hoses are cheap insurance on a high-mileage SUV.
• Flush the fluid. Opening the system is a good moment to replace old fluid with the type printed on the reservoir cap and in the owner's manual.

For the front axle, a combined kit is the simplest path. Our 2016-2020 Kia Sorento front brake kit covers the parts that are usually replaced together on that axle. You can also shop individual brake calipers, brake pads and brake rotors.

How Hard Is the Job?

Front caliper replacement on a Sorento is a moderate driveway job for someone with basic tools, a torque wrench and a way to bleed the brakes. The caliper comes off with its guide bolts, the bracket with two larger bolts, and the brake hose connects with a banjo bolt and fresh sealing washers. Torque every fastener to the value in the factory service manual, and bleed the corner until the fluid runs clean and free of air.

At the rear, the caliper itself works the same way. On EPB-equipped models, remember that the parking brake uses shoes inside the rotor hat. Kia's bulletin describes adjusting those shoes by rotating the star adjuster until the rotor locks, then backing it off five clicks and confirming the rotor spins freely. Kia warns that a poorly adjusted shoe can lead to premature EPB module failure, so check the shoes and springs whenever the rear rotors come off, and follow the factory procedure if the parking brake was disturbed.

Afterward, pump the pedal until it is firm before moving the vehicle, confirm the reservoir level, and bed in new pads with a series of moderate stops. Test drive and check that neither side runs hot.

Frequently Asked Questions

Is there a brake caliper recall on the 2016-2020 Kia Sorento?

We checked NHTSA's recall records for the 2016, 2017 and 2019 Sorento and found none involving calipers, the brake hydraulics or the ABS unit. Recalls for this generation cover items like the tow hitch module, seats and the engine. Always run your own VIN on nhtsa.gov, because recalls can be added at any time.

Can I replace just one caliper?

You can, but it is better to replace both on the axle. Matching calipers give even clamping force side to side, which prevents a new pull and uneven pad wear.

Do I need a scan tool to replace the rear calipers?

On EPB-equipped Sorentos of this generation, Kia's service information shows the parking brake working through shoes inside the rear rotor hat, not through the caliper piston. Check your vehicle before you start: if the rear caliper has an electric motor attached to it, follow the service-mode procedure for that system.

Why is only the inner brake pad worn out?

That pattern almost always means the caliper slide pins are sticking. The piston keeps pushing the inner pad, but the caliper cannot slide to apply the outer one. Clean and lubricate the pins, replace torn boots, and replace the caliper if the pin bores are pitted.

Should I buy new or remanufactured calipers?

Both work well when they come with new seals, boots and a sound piston. The important parts are matching the correct left and right caliper for your Sorento and replacing them as a pair.

Sources

1. NHTSA recall data, 2017 Kia Sorento - no brake, caliper or ABS recalls listed
2. NHTSA recall data, 2016 Kia Sorento - recall list with no brake system campaigns
3. NHTSA recall data, 2019 Kia Sorento - recall list with no brake system campaigns
4. Vehicle Service Pros / Mitchell 1: Adjusting Kia electronic parking brake - 2016+ Sorento EPB shoe adjustment and five-click back-off
5. Genuine Kia Sorento brake caliper catalog - OEM front caliper kit numbers and 2015-2020 engine fitment
6. Haynes: How to diagnose and fix a seized brake caliper - piston vs slide pin symptoms and corrosion causes