Why does my 2021 Toyota Highlander shake during braking?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

643 words

Problem Statement

Learn why your 2021 Toyota Highlander shakes during braking and how to diagnose and fix the issue with our detailed guide.

Affected Component

braking system

Estimated Time

2-4 hours

Symptoms

•The steering wheel shakes or vibrates when applying the brakes.
•The vehicle may feel unstable during the braking process.
•The shaking may be more pronounced at higher speeds and become less noticeable at lower speeds.
•Possible accompanying sounds (e.g., squeaking or grinding) when braking.

Diagnostic Steps

1
Visual Inspection: Check the brake pads and rotors for wear.
2
Check Wheel Balance and Alignment: Ensure that the wheels are properly balanced.
3
Test Drive: Conduct a test drive to confirm when the shaking occurs.
4
Brake Component Examination: Inspect the brake calipers for proper operation.
5
Suspension and Steering Components: Inspect suspension components for wear or damage.

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 rotor gauge
•Caliper tool
•Tire pressure gauge
•Level
•Basic hand tools

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Diagnostic Steps

1
Visual Inspection: Check the brake pads and rotors for wear.
2
Check Wheel Balance and Alignment: Ensure that the wheels are properly balanced.
3
Test Drive: Conduct a test drive to confirm when the shaking occurs.
4
Brake Component Examination: Inspect the brake calipers for proper operation.
5
Suspension and Steering Components: Inspect suspension components for wear or damage.

Solution

Problem: Vehicle Shakes During Braking

Tools Required:

Jack and jack stands
Lug wrench
Torque wrench
Brake rotor gauge (for measuring thickness and runout)
Caliper tool (if brake pads need replacing)
Tire pressure gauge
Level (for checking alignment)
Basic hand tools (sockets, wrenches, screwdrivers)

Repair Instructions:

Step 1: Elevate the Vehicle

Use a jack to lift the vehicle and secure it with jack stands.
Remove the front wheels using a lug wrench.

Step 2: Inspect Brake Rotors and Pads

Remove the brake caliper by unbolting it from the bracket. Use a caliper tool if needed to compress the piston.
Remove the brake pads and inspect them for wear. Replace if they are below the minimum thickness (usually 3 mm).
Measure the thickness of the rotors using a brake rotor gauge. If the thickness is below the minimum spec (typically 24 mm for most rotors), replace the rotors.
Check for warpage by using a dial indicator. The runout should not exceed 0.002 inches. If it does, the rotor should be replaced or turned.

Step 3: Replace or Resurface Rotors

If the rotors are warped, replace them with new ones. Ensure the new rotors are cleaned of any protective coating before installation.
If they are within specs but just need resurfacing, take them to a machine shop or use a brake lathe if available.

Step 4: Reinstall Brake Components

Install new or resurfaced rotors onto the hub.
Apply brake grease to the caliper slide pins and attach the caliper back onto the rotor.
Install new brake pads, ensuring they are positioned correctly within the caliper bracket.
Torque caliper bolts to manufacturer specifications (usually around 25-35 ft-lbs).

Step 5: Check Wheel Alignment and Balance

Inspect and adjust wheel alignment if necessary. This may require a professional alignment service.
Ensure all wheels are balanced properly.

Step 6: Reinstall Wheels and Lower Vehicle

Reinstall the wheels and hand-tighten the lug nuts.
Lower the vehicle and then torque the lug nuts to the specified torque (generally around 80-100 ft-lbs).

Step 7: Final Checks

Pump the brake pedal a few times to ensure the brake pads seat properly.
Conduct a test drive to confirm that the shaking has been resolved.

Conclusion

If the vehicle continues to shake during braking after following these steps, further diagnostics may be required, possibly involving the ABS system or other underlying issues. If you feel uncomfortable performing these repairs, consult a professional mechanic for assistance.