how to fix GMC Sierra T1XX (2019-Present) rear brakes that keep grinding

GMC Sierra T1XX (2019-Present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

679 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 noise in GMC Sierra T1XX rear brakes. 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 wear safety glasses and gloves when working on brakes.
•Ensure the vehicle is securely lifted and supported before working underneath.

Symptoms

•Grinding noise when braking
•Decreased braking performance
•Vibration or pulsation felt in the brake pedal
•Brake warning light illuminated on the dashboard
•Increased stopping distance
•Possible burning smell from the rear brakes

Diagnostic Steps

1
Inspect rear brake pads for wear; measure thickness using a caliper.
2
Check brake rotors for scoring, warping, or any damage.
3
Verify the condition of brake calipers for proper operation and fluid leaks.
4
Examine brake hardware, including shims, springs, and clips, for proper installation and wear.
5
Inspect brake fluid levels and the condition of the fluid.
6
Scan for any error codes related to the braking 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
•Bungee cord
•Caliper tool

Parts Required

•Brake pads
•Brake rotors
•Brake hardware kit
•Brake fluid

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Diagnostic Steps

1
Inspect rear brake pads for wear; measure thickness using a caliper.
2
Check brake rotors for scoring, warping, or any damage.
3
Verify the condition of brake calipers for proper operation and fluid leaks.
4
Examine brake hardware, including shims, springs, and clips, for proper installation and wear.
5
Inspect brake fluid levels and the condition of the fluid.
6
Scan for any error codes related to the braking system using an OBD-II scanner.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface and the ignition is off.
Loosen the lug nuts on the rear wheels while the vehicle is still on the ground.

2. Lift the Vehicle

Use a hydraulic jack to lift the rear of the vehicle and secure it with jack stands.
Remove the rear wheels by fully unscrewing the lug nuts.

3. Remove the Brake Components

Remove the brake caliper by unscrewing the caliper bolts; support the caliper with a bungee cord to avoid strain on the brake line.
Take off the brake pads from the caliper bracket; note their orientation for reinstallation.
Remove the caliper bracket by unscrewing its mounting bolts.
Slide off the brake rotor; if stuck, gently tap it with a rubber mallet.

4. Inspect and Replace Components

Inspect brake pads for wear; replace if thickness is less than 3mm or if they are damaged.
Check the brake rotor for grooves or warping; replace if necessary.
Clean the caliper and bracket with brake cleaner, and inspect for any leaks or damage.
Replace any worn hardware (shims, clips) and lubricate contact points with high-temperature brake grease.

5. Reassemble Brake Components

Install the new or resurfaced rotor onto the hub.
Reattach the caliper bracket and torque the mounting bolts to the manufacturer's specifications (typically around 85-95 ft-lbs).
Place the new brake pads into the caliper bracket.
Reinstall the caliper over the brake pads and secure it with caliper bolts, torquing them to specifications (usually around 25-35 ft-lbs).

6. Final Steps

Reinstall the rear wheels and hand-tighten the lug nuts.
Lower the vehicle off the jack stands using the hydraulic jack.
Torque the lug nuts to the manufacturer's specifications (around 140-150 ft-lbs).
Pump the brake pedal a few times to seat the brake pads properly.