2018-2023 Mitsubishi Eclipse Cross Brake Noise: Squeal, Grinding and Pulsation Causes

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most brake noise on a 2018-2023 Mitsubishi Eclipse Cross comes from one of four things: pads worn down to their built-in wear indicator (a high squeal), pads worn to metal (grinding), uneven rotor thickness (pulsation in the pedal or steering wheel), or dragging, corroded caliper hardware. Each one sounds and feels different, so a few minutes of careful listening and a wheels-off inspection will usually tell you exactly which part to replace.

How the Eclipse Cross Brake System Is Built

The Eclipse Cross uses disc brakes at all four corners. Mitsubishi's workshop manual for the model covers a ventilated single-piston front caliper (with a two-piston front variant listed for some markets) and two versions of the rear caliper: one without an electric parking brake and one with an electric parking brake motor mounted on the caliper. The electric parking brake and the Brake Auto Hold function work through the same electronically controlled hydraulic unit that runs ABS and stability control, which is why the 2018 recall notices for this model mention all of them together.

Two design details matter for noise:

• Wear indicators. The manual shows the front pad with a metal wear indicator installed on the inner side, positioned at the top, and the rear pad with its indicator on the lower side. When the friction material wears down, that tab touches the rotor and squeals on purpose.
• Shims. Front and rear pads use inner and outer anti-noise shims. The manual lists them as separate parts to remove and reinstall, and a missing or dry shim is one of the most common reasons a fresh pad job squeals.

Match the Noise to the Cause

Squeal: Wear Indicators, Shims and Bedding

If the squeal is steady while you drive and changes or stops when you touch the brakes, pull a wheel and look at the inner pad first. The inner pad on a single-piston sliding caliper often wears faster than the outer, and on the Eclipse Cross front it is the one carrying the wear indicator. If the indicator is touching, the pads are due. Replace both sides of the axle as a set; Mitsubishi's own procedure says to replace left and right pads together.

Squeal right after a pad job is a different problem. EBC's technical guidance notes that new-pad squeal usually shows up within the first 200 to 500 miles and often goes away as the pads bed in. If it continues past that, the usual causes are a rotor with a raised lip at the outer edge or an uneven surface, pads installed without their noise shims, or corroded slider pins letting the pad drag and overheat. Fitting new pads to old, lipped rotors is the classic way to buy yourself a noisy brake job.

For a quiet result, choose pads that come with shims and hardware. Our Bosch front ceramic brake pads for the 2018-2023 Eclipse Cross are a good daily-driver choice, and you can compare other options in our ceramic brake pads collection.

Grinding: When the Rotor Is Already Damaged

Grinding means metal is touching metal. Either the friction material is gone and the steel backing plate is riding on the rotor, or something like a stone or a bent dust shield is contacting it. If you ignore the wear indicator squeal, grinding is next. Once the backing plate has cut grooves into the rotor, the rotor needs replacing rather than resurfacing, because cutting deep enough to clean it up will usually take it below the minimum thickness cast into the rotor.

Also look at the caliper piston. When pads wear to the backing plate, the piston sits farther out of its bore than normal, and the exposed section can pick up corrosion. If the boot is torn or the piston is pitted, plan on a caliper as well. You can find rotors in our brake rotors collection and replacement units in brake calipers.

Pulsation: Usually Thickness Variation, Not Warping

A pulsing pedal on an Eclipse Cross is almost always disc thickness variation, often shortened to DTV. Wagner explains the mechanism clearly: as the thicker section of the rotor passes through the caliper with the brakes applied, it pushes the piston back and displaces fluid, and you feel that pressure change in the pedal. Power Stop treats variation beyond .006 inch (0.15 mm) as DTV that calls for resurfacing or replacement.

DTV usually starts with lateral runout, the side-to-side wobble of a rotor as it turns. According to Wagner, most vehicles call for two-thousandths of an inch or less, and even a small amount of rust between the hub and the rotor can push it past that. A wobbling rotor contacts the pad unevenly, and over thousands of miles that becomes uneven wear or uneven pad material deposits, which is the thickness variation you feel. Uneven lug nut tightening can have the same effect.

The fix and the prevention are the same job done properly:

1. Measure rotor thickness at several points around the disc with a micrometer. If it varies or is at the minimum, replace the rotor.
2. Clean the hub face down to bare metal before the new rotor goes on.
3. Check runout with a dial indicator about half an inch in from the rotor edge.
4. Tighten the lug nuts evenly in a star pattern with a torque wrench to the value in the owner's manual, not with an impact gun alone.
5. Bed in the new pads so they lay down an even transfer layer.

Because rotors and pads wear together, many owners replace them as a pair. Options are in our brake pads and brake rotors collections.

Rear Brakes and the Electric Parking Brake

Rear brake work on an Eclipse Cross equipped with the electric parking brake is not a simple push-the-piston-back job. The workshop manual requires putting the parking brake system into maintenance mode first, either with a Mitsubishi scan tool through the EPB actuator test, or through a specific sequence of parking brake switch and Brake Auto Hold switch presses. It then has you disconnect the actuator harness before removing the caliper. Forcing the rear piston back without doing this risks damaging the parking brake actuator. If you do not have a scan tool that supports the Mitsubishi EPB function, follow the switch procedure in the factory manual exactly, or let a shop do the rear axle.

The rear pads have their own wear indicator, mounted on the lower side, so a squeal from the back of the vehicle deserves the same inspection as the front. Rear pads also tend to stick in their brackets when the clips corrode, which can cause a dragging rear brake and uneven wear between the inner and outer pad. Fresh clips and shims from our brake hardware kits collection solve most of that.

Recalls That Affect Braking

NHTSA lists two 2018 campaigns that touch the Eclipse Cross braking systems. Recall 18V621000 covers incorrect software in the hydraulic unit ECU that could prevent ABS, stability control, automatic emergency braking or Brake Auto Hold from intervening. Recall 18V620000 covers forward collision mitigation software that could keep the brakes applied longer than needed after a pedestrian was no longer detected. Both are fixed with a free dealer software update. Neither causes squeal or grinding, but if your Eclipse Cross shows odd automatic braking behavior or brake system warning lights, check your VIN on nhtsa.gov before replacing parts.

How Hard Is the Job?

Front pads and rotors on the Eclipse Cross are a straightforward job for a home mechanic with a jack, stands, a torque wrench and a piston compression tool: remove the caliper bolt, swing the caliper up, replace pads, shims and clips, and reassemble. Rotors add removing the caliper bracket. Plan for an hour or two per axle the first time. The rear is similar mechanically but adds the electric parking brake maintenance-mode step, which is where most DIY rear brake jobs on this model go wrong. Whatever you replace, torque every caliper fastener to the value in the factory service manual, and pump the pedal until it is firm before you move the vehicle.

Frequently Asked Questions

Why do my new Eclipse Cross brakes squeal?

New pads often squeal for the first few hundred miles while they bed in. If the noise continues, check that the anti-noise shims were installed, that the rotors were replaced or resurfaced rather than reused with a lip, and that the slide pins move freely and are lubricated.

Is it safe to drive with the wear indicator squealing?

It is a warning, not a failure, but the pads are near the end of their life. Replace them soon. If you wait until the squeal turns to grinding, you will be buying rotors as well as pads.

Are my rotors warped if the pedal pulses?

Usually not in the literal sense. Pulsation almost always comes from uneven rotor thickness caused by runout, hub rust or uneven pad deposits. Measuring thickness and runout will tell you whether the rotor can be resurfaced or should be replaced.

Can I push the rear caliper piston back on an Eclipse Cross with an electric parking brake?

Not until the system is in maintenance mode. Use a scan tool that supports the Mitsubishi EPB function or the switch procedure from the factory manual, then disconnect the actuator harness before removing the caliper.

Should I replace pads on both sides of the axle?

Yes. Mitsubishi's procedure calls for replacing left and right pads as a set so braking stays even side to side.

Sources

1. Mitsubishi Eclipse Cross Workshop Manual - Brake Pad Replacement - caliper types, shims, wear indicator positions, replace pads as a set, EPB maintenance mode step
2. Mitsubishi Eclipse Cross Workshop Manual - Electric Parking Brake Maintenance Mode - scan tool and switch methods for maintenance mode
3. NHTSA - 2018 Mitsubishi Eclipse Cross Recalls - recalls 18V621000 and 18V620000 and their software remedies
4. EBC Brakes - Brake Squeal Causes and Cures - new-pad squeal window, shims, lipped rotors, corroded slider pins
5. Wagner Brake - Brake Pedal Pulsation and Disc Thickness Variation - DTV mechanism, runout spec, hub cleaning, dial indicator check
6. Power Stop - Why Do I Have a Pulsing Brake Pedal - DTV threshold and fixes