how to fix my GMC Sierra T1XX (2019-Present) rear brakes that are grinding?

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

585 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 grinding rear brakes on 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

•Ensure the vehicle is securely supported on jack stands before working underneath.
•Allow brakes to cool before handling components immediately after use.

Symptoms

•Grinding noise when braking
•Decreased braking performance
•Vibration in the brake pedal
•Warning light for brake system on the dashboard
•Increased stopping distance

Diagnostic Steps

1
Inspect rear brake pads for wear or damage.
2
Check brake rotors for scoring or warping.
3
Examine brake calipers for proper operation and leaks.
4
Inspect brake lines for damage or leaks.
5
Verify brake fluid level and condition.

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
•Lug wrench
•Socket set
•Torque wrench
•Brake grease

Parts Required

•Brake pads
•Brake rotors (if needed)
•Brake caliper hardware (if needed)

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Solution

1. Preparation

Gather tools and parts needed.
Park the vehicle on a flat surface and engage the parking brake.
Place wheel chocks in front of the front wheels.
Disconnect the battery to avoid any electrical issues.

2. Raise the Vehicle

Use a hydraulic jack to lift the rear of the vehicle.
Secure it on jack stands to ensure stability.

3. Remove the Rear Wheels

Use a lug wrench to remove the lug nuts from the rear wheels.
Take off the wheels and set them aside.

4. Inspect and Replace Brake Components

A. Remove Brake Calipers

Remove the caliper bolts using a socket set.
Carefully slide the caliper off the rotor and support it with a bungee cord to avoid stressing the brake line.

B. Remove Brake Pads

Slide the old brake pads out of the caliper bracket.
Inspect for wear; if the friction material is less than 3mm, replace them.

C. Inspect and Replace Rotors

Check the rotor surface for scoring. If significant wear or scoring is present, replace the rotor.
To remove the rotor, remove the retaining screws (if applicable) and slide it off the hub.

D. Install New Brake Pads and Rotors

If replacing the rotor, install the new rotor onto the hub.
Apply brake grease to the backing of the new brake pads and install them into the caliper bracket.

E. Reinstall Brake Caliper

Position the caliper over the new pads and rotor, then reattach the caliper bolts.
Torque the caliper bolts to the manufacturer’s specification (usually around 20-30 ft-lbs).

5. Reassemble the Wheel

Place the wheel back onto the hub and hand-tighten the lug nuts.
Lower the vehicle and tighten the lug nuts to the manufacturer’s specification (typically 75-100 ft-lbs).

6. Final Checks

Reconnect the battery.
Pump the brake pedal a few times to set the brake pads against the rotor.
Check brake fluid level and top off if necessary.