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

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

604 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 issues 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

•Disconnect the battery before working on electrical components.
•Allow brakes to cool before handling to prevent burns.
•Always use jack stands when working under a vehicle.

Symptoms

•Vibration felt through the steering wheel when braking
•Pulsating brake pedal during braking
•Uneven wear on brake pads or rotors
•Noise from the brake system (squealing or grinding sounds)
•Vehicle pulling to one side while braking
•Increased stopping distance

Diagnostic Steps

1
Inspect brake rotors for warping or uneven wear using a dial indicator.
2
Check brake pad thickness to ensure they are within safe limits.
3
Examine suspension components (control arms, bushings, and ball joints) for wear or damage.
4
Verify wheel alignment and balance to rule out related issues.
5
Scan for any fault codes that may indicate problems with the ABS or traction control system.
6
Test drive the vehicle to replicate the symptoms and observe conditions under which they occur.

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
•Floor jack
•Jack stands
•Socket set
•Torque wrench
•Dial indicator for rotor inspection
•Brake bleeder kit

Parts Required

•New brake rotors
•New brake pads
•Brake cleaner
•Anti-squeal grease

Related Faults

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Diagnostic Steps

1
Inspect brake rotors for warping or uneven wear using a dial indicator.
2
Check brake pad thickness to ensure they are within safe limits.
3
Examine suspension components (control arms, bushings, and ball joints) for wear or damage.
4
Verify wheel alignment and balance to rule out related issues.
5
Scan for any fault codes that may indicate problems with the ABS or traction control system.
6
Test drive the vehicle to replicate the symptoms and observe conditions under which they occur.

Solution

1. Preparation

Gather tools and parts necessary for the repair.
Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
Disconnect the battery to prevent electrical issues during repair.

2. Remove Front Wheels

Use a lug wrench to loosen wheel lugs.
Raise the vehicle using a floor jack and secure it with jack stands.
Remove the front wheels to access the brake components.

3. Inspect and Replace Brake Rotors

Inspection:
- Check the rotors for signs of warping using a dial indicator; if warped beyond manufacturer specifications, replace them.
Replacement:
- Remove caliper bolts with a socket wrench and slide the caliper off the rotor.
- Remove the rotor by unscrewing the retaining screws (if applicable) and sliding it off the hub.
- Install the new rotor and secure it with retaining screws.
- Reinstall the caliper over the new rotor and tighten bolts to manufacturer torque specifications (typically 20-30 ft-lbs).

4. Inspect and Replace Brake Pads

Remove old brake pads from the caliper bracket.
Check the caliper bracket for any debris and clean if necessary.
Install new brake pads ensuring they are properly oriented and secure.
Apply anti-squeal grease on the backing of the pads as per manufacturer instructions.

5. Reassemble and Bleed Brakes

Reinstall the front wheels and lower the vehicle to the ground.
Tighten lug nuts to manufacturer specifications (typically 100-140 ft-lbs).
Bleed the brake lines to remove any air using a brake bleeder kit, starting from the farthest wheel from the master cylinder.