why does my GMC Sierra T1XX (2019-Present) shake when I brake

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

541 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 brake shaking 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 disconnect the battery before working on the braking system.
•Allow the vehicle to cool down before working on the brakes to avoid burns.

Symptoms

•Shaking or vibrating felt through the steering wheel when braking
•Pulsating brake pedal
•Increased stopping distance
•Noise from the brakes (squealing or grinding)
•Vehicle pulls to one side during braking

Diagnostic Steps

1
Inspect the brake rotors for warping or scoring using a dial indicator.
2
Check brake pads for uneven wear or contamination.
3
Examine suspension components (control arms, bushings) for wear or damage.
4
Assess tire condition and balance; check for uneven wear or damage.
5
Scan for any error codes related to the ABS system using an OBD-II scanner.

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

•Hydraulic jack
•Jack stands
•Socket set
•Torque wrench
•Brake cleaner
•Dial indicator

Parts Required

•Brake rotors
•Brake pads
•Any necessary suspension components (if worn)

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Diagnostic Steps

1
Inspect the brake rotors for warping or scoring using a dial indicator.
2
Check brake pads for uneven wear or contamination.
3
Examine suspension components (control arms, bushings) for wear or damage.
4
Assess tire condition and balance; check for uneven wear or damage.
5
Scan for any error codes related to the ABS system using an OBD-II scanner.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Wear safety glasses and gloves.

2. Raise the Vehicle

Use a hydraulic jack to lift the front of the vehicle.
Secure with jack stands to ensure safety.

3. Remove Wheel Assembly

Remove the lug nuts using a socket wrench.
Take off the wheel and set it aside.

4. Inspect and Replace Brake Rotors

Inspect: Check the brake rotors for warping or scoring.
- If warped, proceed to replace.
Remove: Unscrew the retaining screws and pull off the rotors.
Replace: Install new rotors, ensuring they are properly seated.
- Torque the rotor screws to manufacturer specifications (typically around 15-20 ft-lbs).

5. Inspect and Replace Brake Pads

Inspect: Check the thickness of the brake pads.
- If less than 3mm, replace them.
Remove: Remove the caliper bolts with a socket wrench and slide off the caliper.
Replace: Swap the old pads for new ones, ensuring proper alignment.
- Use brake grease on the backing of the pads to prevent squeaking.
Reinstall the caliper and torque bolts to manufacturer specifications (typically around 30-40 ft-lbs).

6. Check Suspension Components

Examine control arms, bushings, and tie rods for any signs of wear or damage.
Replace any damaged components as necessary.

7. Reassemble and Lower Vehicle

Reinstall the wheel and hand-tighten the lug nuts.
Lower the vehicle and torque the lug nuts to the manufacturer’s specification (typically around 140-160 ft-lbs).

Tools Required:

Hydraulic jack
Jack stands
Socket set
Torque wrench
Brake cleaner
Dial indicator (for rotor inspection)

Parts Required:

Brake rotors
Brake pads
Any necessary suspension components (if worn)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Always disconnect the battery before working on the braking system.
Allow the vehicle to cool down before working on the brakes to avoid burns.