my GMC Sierra T1XX (2019-Present) is shaking when I brake what should I check

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

559 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 diagnostic procedures 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 electrical components related to the braking system.
•Allow the vehicle to cool down before working on brake components to prevent burns.

Symptoms

•Shaking or vibration felt through the steering wheel while braking
•Pulsation in the brake pedal during braking
•Uneven wear on brake pads or rotors
•Potential noise (squeaking or grinding) when braking
•Vehicle pulling to one side during braking

Diagnostic Steps

1
Inspect brake rotors for warping or uneven wear using a runout gauge.
2
Check brake pads for thickness and ensure they are not worn unevenly.
3
Examine brake calipers for proper operation and any signs of sticking.
4
Inspect suspension components, including control arms and bushings, for any wear or damage.
5
Verify wheel alignment and tire condition including pressure and tread wear.
6
Scan the vehicle for any error codes related to the braking system.

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

•Lug wrench
•Jack and jack stands
•Torque wrench
•Runout gauge
•Brake rotor puller (if necessary)
•Socket set

Parts Required

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

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Diagnostic Steps

1
Inspect brake rotors for warping or uneven wear using a runout gauge.
2
Check brake pads for thickness and ensure they are not worn unevenly.
3
Examine brake calipers for proper operation and any signs of sticking.
4
Inspect suspension components, including control arms and bushings, for any wear or damage.
5
Verify wheel alignment and tire condition including pressure and tread wear.
6
Scan the vehicle for any error codes related to the braking system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface, and secure it with wheel chocks.
Wear safety glasses and gloves.

2. Inspect and Replace Brake Rotors

Tools Required: Lug wrench, jack and jack stands, torque wrench, runout gauge, brake rotor puller (if necessary).
Loosen the lug nuts and raise the vehicle using a jack; secure with jack stands.
Remove the wheel to access the brake assembly.
Use a runout gauge to check for rotor warping; if the runout exceeds manufacturer specifications, replace the rotor.
If rotors are within specs but show uneven wear, consider resurfacing or replacing.

3. Inspect and Replace Brake Pads

Remove the caliper by unscrewing the caliper bolts with a socket set.
Carefully slide the caliper off the rotor and support it without stressing the brake line.
Remove the old brake pads and inspect for even wear; replace if necessary.
Install new brake pads ensuring proper orientation and alignment.

4. Reassemble and Torque Components

Reinstall the caliper and ensure all bolts are tightened to the manufacturer's torque specifications.
Place the wheel back on and hand-tighten lug nuts before lowering the vehicle.
Lower the vehicle and use a torque wrench to tighten the lug nuts to the specified torque.

5. Final Checks

Pump the brake pedal several times to ensure the brake pads seat properly.
Test drive the vehicle at low speeds to verify the repair.