why does my GMC Sierra T1XX (2019-Present) shake when braking?

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

478 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix shaking during braking in GMC Sierra T1XX (2019-Present). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always ensure the vehicle is securely elevated on jack stands before working underneath.
•Wear safety goggles to protect eyes from brake dust and debris.

Symptoms

•Vibration or shaking felt in the steering wheel during braking
•Pulsating brake pedal
•Uneven wear on brake pads or rotors
•Noise such as grinding or squeaking when braking
•Increased stopping distance

Diagnostic Steps

1
Inspect the brake rotors for warping or uneven wear using a dial indicator.
2
Check brake pad thickness and condition for uneven wear or damage.
3
Examine suspension components, including control arms and bushings, for wear or damage.
4
Inspect wheel bearings for play or noise.
5
Verify tire condition and balance to rule out related issues.

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
•Jack stands
•Lug wrench
•Dial indicator
•Torque wrench
•Brake cleaner
•Safety goggles

Parts Required

•Brake rotors (if warped)
•Brake pads (if worn)

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Diagnostic Steps

1
Inspect the brake rotors for warping or uneven wear using a dial indicator.
2
Check brake pad thickness and condition for uneven wear or damage.
3
Examine suspension components, including control arms and bushings, for wear or damage.
4
Inspect wheel bearings for play or noise.
5
Verify tire condition and balance to rule out related issues.

Solution

1. Preparation

Gather tools: jack, jack stands, lug wrench, dial indicator, torque wrench, brake cleaner, and safety goggles.
Ensure the vehicle is on a flat surface and engage the parking brake.

2. Wheel Removal

Use the lug wrench to loosen the lug nuts slightly on the affected wheel.
Raise the vehicle using the jack and secure it with jack stands.
Remove the lug nuts and take off the wheel to access the braking system.

3. Brake Component Inspection

Rotors:
- Using a dial indicator, measure rotor runout at multiple points. If runout exceeds manufacturer specifications, the rotor may need resurfacing or replacement.
Brake Pads:
- Inspect pads for thickness (should be at least 3mm) and look for uneven wear patterns or cracking. Replace if necessary.

4. Suspension Check

Check control arms, bushings, and other suspension components for signs of wear. Replace any damaged components.
If applicable, tighten any loose bolts to manufacturer torque specifications.

5. Reassembly

If rotors and pads are satisfactory, clean the rotor surface with brake cleaner.
Reinstall the wheel, ensuring the lug nuts are hand-tightened.
Lower the vehicle and torque the lug nuts to the manufacturer’s specification (typically around 100-150 ft-lbs).