2014-2019 Kia Soul Front vs Rear Brakes: What Wears First and What to Replace

By Core Brake Parts Tech Team — Circleville, OH warehouse

On a 2014-2019 Kia Soul, the front brakes almost always wear out first. The Soul uses four-wheel disc brakes, and the front discs are larger, thicker and vented because they do most of the stopping work. Plan on front pads before rear pads, but measure both axles every time the wheels come off, because the thinner rear rotors reach their limit with less wear to spare.

How the Soul's Brakes Are Laid Out

Every second-generation Soul sold in the US, including the base trim, came with disc brakes at all four corners. Kia listed four-wheel discs as standard equipment when it announced the 2014 model, along with Vehicle Stability Management and Hill-Start Assist Control. There are no rear drums on this generation, so you will not be shopping for brake shoes unless you are working on a different Kia.

The two axles are built very differently, and that difference explains the wear pattern:

The thickness figures in the table come from the service manual for the standard 280 mm front brake. The 2017-2019 Soul with the 201 hp 1.6L turbo engine uses a larger 12.0 in front rotor, so confirm the part fits your engine before ordering. All engines share the same 10.3 in rear rotor.

Look at the caliper bores. The front piston is much larger than the rear piston, which means that for the same pedal pressure the front pads clamp far harder. That is by design: when you brake, weight shifts forward onto the front tires, so the front axle can use more braking force without locking up. More clamping force means more heat and more friction material worn away up front.

What Wears First, and Why the Rear Still Needs Attention

Front pads and rotors on a Soul are the normal first replacement. The front rotors are vented so they shed heat between stops, and they start at 23 mm thick with 2 mm of allowable wear before they hit the 21 mm limit.

The rear is the axle people forget. The rear rotors are solid and start at only 10 mm thick, with a service limit of 8.4 mm. That is less than 2 mm of usable life, and a rotor that has been machined once may already be near the limit. Rear pads also start almost as thick as the fronts, so an owner who only glances at the front pads can miss rear pads that have worn unevenly or seized in their brackets.

Several things can make Soul rear brakes wear faster than you would expect:

• Stability control and hill-start assist. VSM brakes individual wheels to keep the car pointed straight, and hill-start assist holds brake pressure briefly on inclines. Both put some extra work on the rear pads, especially in hilly areas.
• Seized slide pins or rusted pad abutments. On a car that sees road salt, a rear pad that cannot slide freely drags constantly and wears to the backing plate.
• Parking brake adjustment. The Soul's parking brake is a lever-operated ball-in-ramp mechanism inside the rear caliper. If the cable is out of adjustment or the mechanism sticks, the rear pads can drag.
• Short-trip city driving. Lots of low-speed stops wear all four corners, and a light rear rotor is quick to glaze and groove if the pads are dragging.

Symptoms and How to Check Each Axle

Most brake complaints on a Soul fall into a few patterns. Use them to decide which end to inspect first:

• Squeal that stops when you press the pedal: usually a pad wear indicator touching the rotor. Check the front pads first.
• Pulsing pedal or steering wheel shake when stopping from highway speed: almost always front rotor thickness variation, since the steering wheel is connected to the front knuckles.
• Grinding from the back, or a pulse felt in the seat rather than the wheel: check the rear pads and rotors. Thin solid rear rotors grind through quickly once the pad is gone.
• One wheel much hotter than the others after a drive: a sticking caliper, seized slide pin or dragging parking brake on that corner.
• Brake warning light with the parking brake released: low fluid in the reservoir. Fluid drops slowly as pads wear, but a sudden drop points to a leak.

To measure properly, pull the wheel and read the pad material through the caliper window, then check the rotor with a micrometer in several spots. Compare what you find to the service limits in the table above: 2.0 mm for pad material on either axle, 21 mm for a front rotor and 8.4 mm for a rear rotor. A rotor at or under its limit gets replaced, not resurfaced.

What to Replace, and What to Replace With It

Always replace pads as an axle set, both sides at once. For most Soul owners the practical plan looks like this:

• Front brake job: new front brake pads and, if the rotors are scored, warped or near 21 mm, new front brake rotors. Because the fronts start only 2 mm above their limit, many shops simply replace them with the pads.
• Rear brake job: rear pads plus rear rotors in most cases. With only 1.6 mm between new and the service limit, a worn rear rotor rarely has enough material left to machine.
• Hardware: new abutment clips and slide-pin boots from a brake hardware kit. Clean and lubricate the slide pins with brake-specific grease. Seized hardware is a leading cause of uneven pad wear.
• Calipers: if a piston will not retract, a boot is torn, or one corner runs hot, replace the caliper. See our brake calipers.
• Fluid: brake fluid absorbs moisture over time. Use the fluid grade printed on the reservoir cap or listed in your owner's manual, and never mix fluid types. Keep the level between the MIN and MAX marks.

For a daily-driven 1.6L or 2.0L Soul, a quality ceramic pad is a good match: quiet, low dust and easy on rotors. For example, the Bosch front ceramic brake pads for the 2014-2019 Kia Soul fit the standard front brake. Browse all ceramic brake pads if you want other options.

How Hard Is the Job?

Front pads and rotors on a Soul are a straightforward job for a careful DIYer with a jack, jack stands, a torque wrench and basic hand tools. Remove the caliper, hang it so the hose is not stretched, remove the bracket, swap the rotor, clean the hub face, install new hardware and pads, and reassemble. Torque every fastener to the value in the factory service manual and tighten wheel lug nuts in a star pattern.

The rear is a little more involved because the parking brake mechanism lives inside the rear caliper. Release the parking brake fully before starting. Depending on the caliper design, the rear piston may need to be rotated back with a caliper wind-back tool rather than pushed straight in, so check the service manual procedure before forcing it. After the job, pump the pedal until it is firm before driving, check that the parking brake holds, and bed in the new pads with a series of moderate stops.

No brake-system recalls are listed for the 2016 Soul in NHTSA's recall database, so a Soul brake problem is normally a wear or maintenance issue rather than a factory defect. It is still worth running your own VIN through NHTSA's lookup before any repair.

Frequently Asked Questions

Does the 2014-2019 Kia Soul have rear drum brakes?

No. Every trim of this generation uses disc brakes front and rear, with vented discs in front and solid discs in back. Kia made four-wheel discs standard even on the base model.

Should I replace front and rear brakes at the same time?

Not automatically. The front brakes usually wear out first, so replace the axle that is worn. Measure the other axle while you are there, and if its pads are close to 2 mm or its rotors are near the service limit, do both to save a second teardown.

Are the brakes on the Soul turbo different?

Yes, at the front. The 2017-2019 Soul with the 1.6L turbo uses a 12.0 in front rotor instead of the 11.0 in rotor on the 1.6L and 2.0L models. The rear brakes are the same 10.3 in size on all engines. Check fitment by engine before buying front parts.

Can I resurface Soul rear rotors?

Only if they are still above the 8.4 mm service limit after machining. They start at 10 mm, so there is very little material to remove. In practice most worn rear rotors are replaced.

Why are my rear pads worn more than my fronts?

That is not normal on a Soul. It usually points to a seized slide pin, a sticking rear caliper piston or a parking brake that is not fully releasing. Fix the cause, or the new pads will wear out just as fast.

Sources

1. Kia Soul 2014-2019 service manual: brake system specifications - rotor and pad thickness, service limits, caliper bores, ball-in-ramp parking brake
2. Kia Media: 2014 Kia Soul specifications - vented front and solid rear discs, 11.0 in front and 10.3 in rear rotors
3. Kia Media: 2017 Kia Soul specifications - 12.0 in front rotor on the 1.6L turbo, engine lineup
4. Kia Media: pricing announcement for the 2014 Soul - standard four-wheel disc brakes, VSM and Hill-Start Assist Control
5. Kia Soul 2014-2019 owner's manual: brake fluid - fluid level between MIN and MAX, do not use improper fluids
6. NHTSA recall database: 2016 Kia Soul - no brake-system recalls listed