Why is the car shaking when braking in my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

609 words

Problem Statement

Learn about the causes and solutions for car shaking when braking in a 2020 Toyota Highlander. Follow diagnostic steps and repair instructions.

Affected Component

brake system

Estimated Time

2-4 hours

Symptoms

•The vehicle shakes or vibrates when applying the brakes.
•The shaking may be felt in the steering wheel or throughout the vehicle.
•The shaking may worsen at higher speeds or during hard braking.
•Potential noise from the brakes such as grinding or squeaking.

Diagnostic Steps

1
Visual Inspection
2
Measure Rotor Thickness
3
Check for Brake System Issues
4
Test Drive

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

•Safety glasses
•Jack and jack stands
•Lug wrench
•Torque wrench
•Flashlight
•Micrometer or brake caliper gauge
•Brake fluid tester (optional)

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Car Shaking When Braking in a 2020 Toyota Highlander

Possible Causes

Warped brake rotors.
Worn or uneven brake pads.
Faulty brake calipers.
Suspension issues (e.g., worn out or damaged components).
Wheel alignment or balance issues.

Step 1: Visual Inspection

Tools Required:

Safety glasses
Jack and jack stands
Lug wrench
Torque wrench
Flashlight

Instructions:

Ensure Safety: Park the vehicle on a level surface and engage the parking brake.
Remove Wheel: Use the lug wrench to loosen the wheel lug nuts, then lift the vehicle with a jack and secure it with jack stands. Remove the wheel.
Inspect Brake Components:
- Brake Pads: Check the thickness. If less than 3mm, they should be replaced.
- Brake Rotors: Look for signs of warping (discoloration, uneven surfaces) or scoring.
- Calipers: Inspect for leaks or sticking calipers.
Suspension Components: Check for any visible damage or wear on suspension parts (e.g., control arms, bushings).

Step 2: Measure Rotor Thickness

Tools Required:

Micrometer or brake caliper gauge

Instructions:

Measure the thickness of the brake rotors at multiple points around the rotor surface to check for warpage.
Check against the manufacturer's specifications for minimum rotor thickness.

Step 3: Check for Brake System Issues

Tools Required:

Brake fluid tester (optional)

Instructions:

Inspect brake fluid level and condition. Low or contaminated fluid can affect brake performance.
If needed, perform a brake fluid quality test.

Step 4: Test Drive

Instructions:

Reinstall the wheel and tighten the lug nuts to the manufacturer’s torque specifications.
Lower the vehicle and perform a test drive to replicate the shaking.
Pay attention to the severity and frequency of the shaking.

Repair Instructions

If Warped Rotors are Confirmed

Remove the Wheel: Follow the same steps as above to access the brake assembly.
Remove the Brake Caliper:
- Use a socket set to remove the caliper mounting bolts.
- Support the caliper using a bungee cord or similar method to avoid straining the brake line.
Remove the Brake Pads: Slide out the brake pads from the caliper bracket.
Remove the Rotors:
- If the rotor is held on by screws, use a screwdriver to remove them.
- Slide the rotor off the hub.
Replace or Resurface Rotors:
- If the rotor is within specs, you may choose to have it resurfaced. Otherwise, replace with OEM parts.
Reinstall Components:
- Install the new or resurfaced rotor.
- Reinstall the brake pads and caliper.
- Ensure all bolts are tightened to specification.

If Brake Pads are Worn

Replace the pads according to the above steps in “Remove the Brake Pads” and “Reinstall Components”.

If Suspension Issues are Found

Inspect the affected components and replace as necessary. This may include control arms, bushings, or struts.

If Wheel Alignment or Balance is Off

Visit a professional alignment shop to get a proper alignment and balance performed.

Conclusion

After completing repairs, perform a test drive to ensure the shaking has been resolved. If the issue persists, further diagnostics may be needed to explore other components in the braking or suspension systems. Always refer to the vehicle's service manual for specific torque specifications and repair procedures.