2011-2019 Ford Explorer Brake Noise: Squeal, Grinding and Pulsation Causes

By Core Brake Parts Tech Team — Circleville, OH warehouse

Most brake noise on a 2011-2019 Ford Explorer comes down to three things: a high-pitched squeal from pads, shims or dry slide hardware; a grinding sound from pads worn to metal or a scored rotor; and a pulsing pedal or shaking wheel from rotor thickness variation, usually started by rust on the hub face or uneven lug nut torque. Ford's own owner's guide says occasional brake noise is normal, but continuous grinding, continuous squeal, or a steady shudder while braking means it is time for an inspection.

How the Explorer's Brakes Are Built

This generation of Explorer (the unibody model launched for 2011 and sold through 2019) uses disc brakes at all four corners with ABS. Ford's parts catalog lists front and rear rotors, calipers and pads for these trucks, and it separates them into standard-duty and heavy-duty brake packages. That matters when you buy parts: pads and rotors for one package do not always fit the other, so match your parts to the calipers and rotor size already on your truck, not just the model year.

The parking brake on the 2015 model is foot-operated: the owner's guide tells you to press the parking brake pedal down fully to set it and press it again to release it. There is no electronic parking brake motor to retract before a rear pad job on that setup. Ford specifies Motorcraft DOT 4 Low Viscosity High Performance brake fluid meeting WSS-M6C65-A2, and warns that other fluids may degrade brake performance.

Squeal: The Most Common Explorer Brake Noise

Squeal is vibration. When the pad rubs the rotor, small changes in friction set the pad, caliper and rotor vibrating, and when that frequency lands in the range your ear picks up, you hear a squeal. Bendix's technical bulletin on brake noise points to three main contributors: inconsistent friction across the rotor surface, rotor condition (poor metallurgy or rough machining), and resonance carried through the brake and suspension parts.

On a daily-driven Explorer, the usual squeal causes are:

• Dry or missing lubrication on caliper slide pins, pad abutment points and the back of the pad where it touches the caliper fingers and piston.
• Missing or worn shims. Coated shims damp vibration far better than bare steel. Reusing tired shims or leaving them off is a quick way to create noise.
• Glazed pads or a glazed rotor from hard stops or dragging brakes.
• A worn pad wear indicator. Many pads carry a small steel tab that starts to chirp on the rotor when the friction material is getting thin. This squeal shows up while driving and often fades when you press the pedal.
• Moisture and light surface rust after rain or a car wash. Ford notes wet brakes are less effective and recommends gently pressing the pedal a few times after driving through water to dry them. Noise that clears after the first few stops is normal.

Diagnose squeal by when it happens. Noise only on the first stops of a damp morning is surface rust. Noise while rolling with your foot off the pedal is usually the wear indicator or a dragging pad. Noise only while braking, on dry pavement, points to glazing, missing shims or dry hardware.

Grinding: Stop Driving and Check the Pads

Ford's guide is direct about this one: a metal-to-metal, continuous grinding sound may mean the brake linings are worn out. Once the friction material is gone, the steel backing plate cuts into the rotor. Every mile you keep driving makes the rotor damage deeper and stretches your stopping distance.

Other grinding sources are less serious but still worth checking:

• A stone or debris trapped between the rotor and the splash shield. This usually makes a constant scraping noise that does not change much with pedal pressure.
• A bent splash shield touching the rotor after a tire change or pothole.
• A scored rotor with deep grooves from a previous set of pads that ran too low.
• A seized caliper or slide pin that keeps one pad dragging, which wears that pad unevenly and fast.

Pull the wheel and look. Check the remaining pad material on both the inner and outer pads; the inner pad often wears first and is the one you cannot see through the wheel spokes. If either pad is down to the backing plate, plan on pads and rotors together.

Pulsation and Shudder: Rotor Thickness Variation

A pulsing brake pedal or a steering wheel that shakes while slowing from highway speed is almost always disc thickness variation (DTV). Ford's guide says continuous vibration or shudder in the steering wheel while braking calls for an inspection.

Wagner's technical guidance explains how it develops. Lateral runout, the rotor wobbling side to side as it spins, lets the pad touch one spot on the rotor on every revolution. With semi-metallic pads, that contact wears thin spots into the rotor. With ceramic pads, pad material transfers onto the rotor and builds thick spots. Either way the rotor ends up uneven, the caliper pistons get pushed back and forth, and you feel it in the pedal.

The root cause is usually on the hub, not the rotor. Wagner notes that even a small piece of rust on the mating surface of the hub and rotor can cause lateral runout, and recommends measuring runout after installation, typically to two thousandths of an inch or less, or the manufacturer's specification. Power Stop lists incorrect rotor installation, uneven clamping, rust and dirt deposits, and irregular pad friction patterns as common causes, and says thickness measured at six or more points should not vary by more than .001 inch; variation beyond .006 inch indicates DTV that may require replacement.

The Explorer is a heavy three-row SUV, so it puts a lot of heat into its brakes on long downhill stops and when towing. Heat speeds up uneven pad deposits, which is one reason pulsation is such a common complaint on trucks this size.

The Fix: Which Parts and What to Replace Together

Match the repair to the noise:

For quiet, low-dust daily driving, ceramic brake pads for SUVs are the usual choice. We carry a 2011-2019 Ford Explorer front ceramic brake pad set built for this generation. If the rotors are scored, below minimum thickness, or causing pulsation, replace them as a pair from our brake rotor collection. New brake hardware kits (abutment clips and pin boots) are cheap insurance against squeal coming back, and if a caliper is seized, see our replacement brake calipers.

Things to do every time on this truck:

• Clean the hub mounting face to bare metal before installing a rotor.
• Clean new rotors of their protective coating with brake cleaner.
• Lubricate slide pins and pad contact points with a high-temperature brake lubricant, keeping it off the friction surfaces.
• Torque the caliper bracket bolts and lug nuts to the values in the factory service manual, lugs in a star pattern with a torque wrench, not an impact gun.
• Bed in the new pads following the pad maker's break-in procedure.
• Check fluid level and condition, topping off only with fluid meeting Ford's WSS-M6C65-A2 specification.

How Hard Is the Job?

A pad and rotor job on a 2011-2019 Explorer is a solid intermediate DIY task. On the front, you remove the wheel, unbolt the caliper, remove the caliper bracket to free the rotor, then clean, lubricate and reassemble. The rear is similar, and with the foot-pedal parking brake there is no electronic service mode to worry about. A first-timer should plan on a few hours per axle with basic hand tools, a torque wrench, a caliper piston tool and jack stands. If the caliper bracket bolts are rusted in or a slide pin is seized, allow extra time.

Frequently Asked Questions

Is some brake noise normal on a Ford Explorer?

Yes. Ford's owner's guide states occasional brake noise is normal. Continuous grinding, continuous squeal, or steady shudder in the steering wheel while braking is not, and should be inspected.

Why do my Explorer brakes squeal after new pads were installed?

The most common reasons are missing or reused shims, dry slide pins and contact points, old hardware clips, or pads that were not bedded in. Rough or reused rotors can also cause it. Fresh hardware and proper lubrication fix most cases.

Can I just resurface warped rotors on my Explorer?

If the rotor is still above its minimum thickness after machining, resurfacing can remove thickness variation. But if the hub face was rusty, the pulsation will return. Clean the hub and check runout either way. Many owners replace the rotors because machining leaves less material to absorb heat.

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

Not always. If the rotors are smooth, within thickness specification, and not causing pulsation, new pads can go on the old rotors. If they are grooved, blued, below minimum, or the pads wore to metal, replace them.

What brake fluid does a 2011-2019 Explorer use?

Ford specifies Motorcraft DOT 4 Low Viscosity High Performance Motor Vehicle Brake Fluid, or an equivalent meeting WSS-M6C65-A2. Keep the fluid clean and dry.

Will ceramic pads stop the squeal?

Ceramic pads are generally quieter and produce less visible dust than semi-metallic pads, but no compound will stay quiet with dry hardware or missing shims. Install them with new hardware and proper lubrication for the best result.

Sources

1. Ford 2015 Explorer Owner's Guide - brake noise guidance, wet brakes, foot-operated parking brake, ABS and Brake Assist, DOT 4 LV WSS-M6C65-A2 fluid
2. Ford Parts Giant - 2013 Explorer front brake discs and calipers - front disc brakes, standard and heavy-duty packages
3. Ford Parts Giant - 2013 Explorer rear brake discs and calipers - rear disc brakes, standard and heavy-duty calipers and pads
4. Bendix Technical Bulletin: Brake Noise In-Depth - causes of squeal, shims and lubrication
5. Wagner - Brake Pedal Pulsation and Disc Thickness Variation - runout, hub rust, pad deposit behavior, runout target
6. Power Stop - Pulsing Brake Pedal and DTV - DTV causes and measurement thresholds