Why does my 2020 Highlander make a grinding noise when braking?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

666 words

Problem Statement

Learn how to diagnose and fix the grinding noise when braking in your 2020 Toyota Highlander. Step-by-step guide with tools required and estimated repair time.

Affected Component

brake system

Estimated Time

2-4 hours

Symptoms

•A grinding noise occurs when applying the brakes.
•Noise may be present during light braking, hard braking, or both.
•Possible feeling of vibration in the brake pedal.
•Warning lights on the dashboard may or may not appear.

Diagnostic Steps

1
Visual Inspection
2
Inspect Brake Components
3
Listen for Noise

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Jack and jack stands
•Lug wrench
•Torque wrench
•Brake cleaner
•Mechanic's gloves
•Safety goggles
•Flashlight
•Caliper tool (if replacing brake pads)
•Brake pad thickness gauge (optional)

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Solution

Problem Diagnosis: Grinding Noise When Braking in 2020 Toyota Highlander

Potential Causes

Worn brake pads.
Contaminated brake pads or rotors.
Damaged or worn brake rotors.
Installation issues (incorrectly installed brake components).
Debris between brake components.

Required Tools

Jack and jack stands
Lug wrench
Torque wrench
Brake cleaner
Mechanic's gloves
Safety goggles
Flashlight
Caliper tool (if replacing brake pads)
Brake pad thickness gauge (optional)

Step 1: Visual Inspection

Safety First: Park the vehicle on a level surface, engage the parking brake, and wear safety gear.
Lift the Vehicle: Use a jack to lift the front or rear of the Highlander (depending on the origin of the noise) and secure it with jack stands.
Remove the Wheel: Use a lug wrench to remove the wheel where the noise is originating from.

Step 2: Inspect Brake Components

Check Brake Pads: Look for wear indicators on the brake pads. If the pads are less than 1/8 inch thick, they need replacement.
Inspect Rotors: Examine the brake rotors for grooves, scoring, or any signs of damage. Use a flashlight for better visibility.
Check for Debris: Look for any debris or dirt lodged between the rotor and the brake pads.
Inspect Calipers: Ensure the calipers are not sticking and that the caliper slides are properly lubricated.

Step 3: Listen for Noise

Manual Test: While the wheel is off, have an assistant press the brake pedal. Listen for any grinding noise as the brake pads press against the rotor.
Check for Movement: Ensure the brake calipers are moving freely and not stuck.

Possible Repairs

Repair Option 1: Replace Brake Pads

Remove Caliper: Use a socket wrench to remove the caliper bolts and slide the caliper off the rotor.
Remove Old Brake Pads: Remove the old brake pads from the caliper bracket.
Compress Caliper Piston: Use a caliper tool to push the piston back into the caliper, allowing room for new pads.
Install New Brake Pads: Place the new brake pads into the caliper bracket, ensuring they are properly seated.
Reinstall Caliper: Slide the caliper back over the new pads and torque bolts to manufacturer specifications (typically around 25-30 ft-lbs).

Repair Option 2: Resurface or Replace Rotors

Remove Rotor: If the rotor is damaged, remove it by taking off the caliper bracket (if applicable) and then the rotor retaining screws (if equipped).
Inspect for Warping: Use a dial indicator to check for any warping. If warped beyond specification, replace the rotor.
Resurface Rotor: If the rotor is within allowable limits, it can be resurfaced at a machine shop.
Reinstall Rotor: If replaced, install the new rotor and torque the retaining screws to specifications.

Repair Option 3: Clean and Lubricate

Clean Components: Use brake cleaner to clean the brake pads, rotors, and calipers from dust or debris.
Lubricate: Apply brake grease to the caliper slides and back of the brake pads (avoid contact with the friction surface).

Conclusion

Reassemble: Reinstall the wheel, tighten lug nuts to specifications (typically 76-80 ft-lbs), and lower the vehicle.
Test Drive: Before driving, pump the brake pedal a few times to set the brake pads against the rotor.
Evaluate: Take the vehicle for a short drive to assess whether the grinding noise is resolved.

Additional Notes

If the grinding noise persists after performing these steps, further diagnosis may be required, including checking the brake booster, master cylinder, and ABS system.
Regular maintenance and inspections of the brake system can prevent issues from arising.