Stop the Grind: Diagnosing and Fixing Your Expedition's Noise

How to Fix Grinding Noise

A grinding noise in your 2020 Ford Expedition is a serious symptom that demands immediate attention. This sound is often a metal-on-metal warning of a significant mechanical issue. Based on real owner experiences, this problem can stem from several areas, including the fuel system, brakes, or drivetrain components, and ignoring it can lead to costly repairs. As one owner dealing with related drivability issues advised, "The answers you are getting... smacks of incompetence. You can get advice here, but you need someone real who looks at that truck." This underscores the importance of a proper, hands-on diagnosis for a noise this severe.

Symptoms

Owners describe a grinding noise that is unmistakable and alarming. It is not a subtle tick or hum but a harsh, grating sound that often increases with vehicle speed or changes with braking. This noise is frequently accompanied by other concerning symptoms that help pinpoint the underlying cause.

You may feel a pronounced shake or vibration through the steering wheel, floorboard, or brake pedal, especially when the grinding occurs. This shake often indicates a rotating component is out of balance or making improper contact. In some cases related to fuel or ignition issues that cause engine strain, owners have reported a loss of acceleration or hesitation, which can sometimes manifest alongside unusual noises as the engine labors.

Other reports include a general rattling noise, which could be a separate issue or a related symptom of something loose in the suspension or exhaust system being vibrated by the primary grinding source. Brake problems are also commonly linked; a grinding noise when applying the brakes is a classic sign of severely worn brake pads where the backing plate is grinding against the rotor.

Most Likely Cause

Based on owner discussions linking grinding noises to other reported issues, the most likely cause is a problem within the brake system or a failing drivetrain component. While the provided data highlights fuel system and vacuum leaks as causes for performance issues like stalling and hesitation, a true grinding noise is most often mechanical. Worn-out brake pads that have exhausted their friction material will cause the metal backing plate to grind directly against the brake rotor. This creates a loud, metallic grinding sound that is typically most apparent when braking but can sometimes be heard at low speeds even without brake application.

Alternatively, issues within the wheel bearings, CV joints, or differential can produce a grinding or growling noise that changes with speed. Problems in the fuel system (like a failing fuel pump) or ignition system (like severely worn spark plugs) can cause engine misfires and shaking that might be perceived as or contribute to a grinding sensation, but they are less likely to be the direct source of a metallic grinding sound.

How to Diagnose

Diagnosing a grinding noise requires a systematic approach to isolate the source. You will need a safe, level place to work like a driveway or garage, a jack and jack stands, a flashlight, and a mechanic's stethoscope (or a long screwdriver) to help pinpoint noises.

First, try to identify when the noise occurs. Does it happen when moving, only when braking, when turning, or when accelerating? Drive at low speed in a safe, empty parking lot and listen carefully. If the grinding is directly tied to brake pedal application, the brake system is your primary suspect. If the noise is constant and changes pitch with speed, focus on wheel bearings or drivetrain components.

For a brake inspection, safely lift and secure the vehicle, then remove the wheels. Visually inspect the brake pads through the caliper opening. If you see less than 1/4 inch of friction material, or if you see metal backing plate in contact with the rotor, you've found the issue. Check the rotors for deep grooves or scoring. Spin the tire by hand with the brake disengaged. If you hear grinding or feel roughness, it could be a wheel bearing. As one owner emphasized about finding competent help, "you need someone real who looks at that truck." A thorough visual and physical inspection is key.

Step-by-Step Fix

If your diagnosis points to worn brake pads and rotors, here is a step-by-step guide to replacement. Always consult a factory service manual for exact torque specifications for your 2020 Expedition.

1. Gather Parts and Tools: Ensure you have new brake pads, rotors, brake cleaner, a C-clamp or brake caliper piston tool, and the necessary sockets and wrenches. 2. Secure the Vehicle: Park on a level surface, set the parking brake, and chock the wheels opposite the one you're working on. Loosen the lug nuts on the target wheel slightly before lifting. 3. Lift and Support: Use a jack on the proper lift point and secure the vehicle with a jack stand. Remove the lug nuts and the wheel. 4. Remove the Caliper: Locate the two caliper guide pins on the back of the caliper. Remove them with the appropriate socket. Carefully lift the caliper off the rotor and suspend it from the suspension with a wire or bungee cord—do not let it hang by the brake hose. 5. Remove Old Pads and Rotor: Slide the old brake pads out of the bracket. You may need to remove two anti-rattle clips. The rotor should now slide off the hub. If it's stuck, you may need to tap it gently with a rubber mallet or use a puller. 6. Prepare and Install New Rotor: Clean the new rotor with brake cleaner to remove any protective oil. Slide it onto the hub. 7. Compress the Caliper Piston: Before installing new, thicker pads, you must push the caliper piston back into its bore. Use a C-clamp or caliper tool, placing the old brake pad against the piston to avoid damage. Open the brake fluid reservoir cap first to relieve pressure. 8. Install New Pads: Place the new pads into the caliper bracket, along with any new anti-rattle clips or shims that came with your pad set. 9. Reinstall the Caliper: Carefully lower the caliper over the new rotor and align it with the bracket. Reinstall and torque the guide pins. 10. Final Steps: Reinstall the wheel, lower the vehicle, and torque the lug nuts to specification. Before driving, pump the brake pedal several times until it feels firm to seat the pads against the rotors.

As one owner shared about tackling a different but similarly mechanical job: "not a hard job to do yourself if you handy with a wrench just make sure you... torque down the new [parts]. the rear ones are the hardest to reach." This philosophy applies directly to brake work.

Parts and Tools Needed

For a brake job, you will need model-specific parts. While part numbers can vary by trim and drivetrain, here are the general tools and parts.

• Parts:
  • Front or Rear Brake Pad Set (Motorcraft brand is recommended for OEM fit)
  • Front or Rear Brake Rotors (Ensure they are matched to your trim, e.g., standard vs. heavy-duty)
  • Brake Cleaner Spray
  • High-Temperature Brake Grease (for caliper guide pins)
• Tools:
  • Floor Jack and Jack Stands (rated for the vehicle's weight)
  • Lug Nut Wrench/Socket
  • Socket Set (including sizes for caliper guide pins, typically 7mm or similar)
  • Torque Wrench
  • C-Clamp or Brake Caliper Piston Tool
  • Wire or Bungee Cord (to hang caliper)
  • Gloves and Safety Glasses

Real Owner Costs

The cost to fix a grinding noise varies dramatically based on the cause and who does the work. For a common issue like brake pad and rotor replacement, here are real-world cost perspectives from owners on related repairs.

A DIY brake job is the most cost-effective. Parts for one axle (pads and rotors) can range from $250 to $500 for quality components. Your only other cost is your time and any tools you don't already own. As an owner noted on a spark plug job, "Afaik, once you get the break-ey... original plugs out the first time around, there's absolutely no need to spend $300 labor on a simple procedure the second time around." The same logic applies to brakes—it's a standard maintenance procedure.

Professional repair costs are significantly higher. For a shop to replace pads and rotors on one axle, expect to pay between $400 and $800 in parts and labor. One owner quoted a dealer for a different service, stating, "The local Ford dealer was the lowest quote I received," which was $400 for a spark plug replacement. Brake work at a dealer will likely be in a similar or higher range. Another owner mentioned a transmission flush quote of $800, illustrating how dealership labor rates can quickly escalate costs for any job. For a full brake job on both axles at a dealership, costs can easily exceed $1,000.

Prevention

Preventing a grinding noise largely revolves around proactive maintenance and attentive listening.

Regular Brake Inspections: Have your brake pads inspected at every oil change or tire rotation. Most pads have wear indicators that emit a high-pitched squeal when they are getting low—this is your warning before grinding starts. Don't ignore this sound. Address Shakes and Rattles Promptly: A minor shake or rattle can be an early sign of a component loosening or wearing out. Investigating these early can prevent them from developing into a major grinding issue. Follow Severe Service Schedules: If you do a lot of towing, hauling, or city driving, your brakes and suspension components wear faster. Consider more frequent inspections. Use Quality Parts and Fluids: When maintenance is performed, using OEM or high-quality equivalent parts ensures longevity and proper fit. As one owner specified for a filter, "I ordered the filter (Motorcraft FG-1036)," highlighting the importance of the correct part.

What Owners Say

Real experiences from FORD owners:

Owner Experiences

"I ordered the filter (Motorcraft FG-1036) through O'reilly's website. Might have to send it back if I can't find it or doesn't exist outside the tank...Thanks!" — BluBlocker (source)

"I'm back now to disclose some issues I've had. First off- My AC was 22 pounds low so, the local Total Care mechanic put dye in with the top-off so he can check for leaks in a week." — Donny Kelley (source)

"While unrelated, it wouldn't hurt to change the transmission fluid too. Then you'll be up to date with maintenance and your problem will probably go away." — Trainmaster (source)

Pro Tips from Owners

💡 "On idle it was fine. I decided on doing full plug and coil replacement problem was solved but I can tell you the original plus were gone gap was out of tolerance and the electrode on some of the plugs seems complete burn out. not a hard job to do yourself if you handy with a wrench just make sure you vacuum around the plugs first to prevent any debri getting into the engine and torque down the new plugs. the rear ones are the hardest to reach." — Luis Gomez (source)

💡 "I decided on doing full plug and coil replacement problem was solved but I can tell you the original plus were gone gap was out of tolerance and the electrode on some of the plugs seems complete burn out. not a hard job to do yourself if you handy with a wrench just make sure you vacuum around the plugs first to prevent any debri getting into the engine and torque down the new plugs. the rear ones are the hardest to reach." — Luis Gomez (source)

Real Repair Costs

"You're absolutely right, but I couldn't convince/assure any other mechanic that the first set had already been replaced. No one would touch it for less than $400 so I figured I'd rather it be done by someone with experience." — member11 (source)

"No one would touch it for less than $400 so I figured I'd rather it be done by someone with experience. The local Ford dealer was the lowest quote I received." — member11 (source)

"I guess my main question there would be: Can they check for Transmission Fluid Leaks when they flush, or do they need to remove the Radiator? Because I know a Flush Job does not run $800!" — Donny Kelley (source)

FAQ

Q: How long does it take to fix a grinding noise from the brakes? A: For a competent DIYer, replacing brake pads and rotors on one axle (either front or rear) typically takes 2 to 3 hours for the first time, including setup and cleanup. A professional mechanic at a shop can usually complete the same job in 1 to 1.5 hours per axle.

Q: Can I drive my Expedition with a grinding noise? A: No, you should not. A grinding noise from the brakes means the friction material is gone and metal is grinding on metal. This destroys the expensive brake rotors very quickly and severely reduces braking power, creating a serious safety hazard. If the grinding is from a wheel bearing or drivetrain, continued driving can lead to catastrophic failure and the wheel seizing or components breaking.

Q: Is this a common issue on the 2020 Expedition? A: While brake wear is a universal maintenance item on all vehicles, the frequency of reports linking grinding noises to other symptoms like shaking and stalling in owner discussions suggests that owners of this model should be particularly vigilant. Regular inspection is the best defense against it becoming a common problem for you.

Q: DIY vs mechanic - what's recommended for a grinding noise fix? A: If the diagnosis is straightforward like brake pads and rotors, and you are mechanically inclined with the proper tools, DIY is a great way to save significant money. As an owner put it regarding a plug replacement, "not a hard job to do yourself if you handy with a wrench." However, if you are unsure of the source of the noise, lack tools, or the diagnosis points to something more complex like internal transmission or differential issues, a professional mechanic is strongly recommended. Misdiagnosis can be costly.

Q: Could a transmission problem cause a grinding noise? A: Yes, internal transmission issues can cause grinding, but it is less common than brake-related grinding. Transmission grinding might occur during gear shifts. One owner's discussion about transmission fluid service highlights its importance: "While unrelated, it wouldn't hurt to change the transmission fluid too. Then you'll be up to date with maintenance and your problem will probably go away." Proper maintenance can prevent some drivetrain noises.

Q: What if the grinding happens only when I turn? A: A grinding noise specifically during turns is a classic symptom of a failing outer CV joint on the front axle. The joint wears out and the bearings inside grind when angled during a turn. This requires replacement of the CV axle assembly and should be addressed promptly.