Why is my 2019 Chevrolet Silverado 1500 T1XX making a grinding noise when braking?

Problem Diagnosis: Grinding Noise When Braking

Symptoms:

• Grinding noise occurs when applying brakes.
• Noise may be more pronounced during hard braking or when the vehicle is in motion.
• Possible vibration felt through the brake pedal.
• In some cases, a burning smell may accompany the noise, indicating overheating.

Tools Required

• Tire iron or lug wrench
• Jack and jack stands
• Brake cleaner
• Torque wrench
• C-clamp or brake caliper tool
• Socket set
• Screwdriver set
• Inspection mirror (optional)
• Flashlight

Repair Instructions

Step 1: Raise the Vehicle

1. Park on Level Ground: Ensure the vehicle is parked on a flat surface and in gear (or in "Park" for automatics).
2. Loosen Lug Nuts: Use a tire iron to slightly loosen the lug nuts on the wheel corresponding to the grinding noise (front or rear).
3. Jack Up the Vehicle: Place a jack under the appropriate jacking point and raise the vehicle. Secure it with jack stands.

Step 2: Remove the Wheel

1. Remove Lug Nuts: Fully remove the loosened lug nuts and take off the wheel.
2. Inspect the Brake Assembly: Use a flashlight and inspection mirror to look at the brake pads, rotors, and calipers.

Step 3: Check Brake Pads and Rotors

1. Remove Brake Caliper:

   • Use a socket to remove the caliper bolts.
   • Carefully slide the caliper off the rotor; support it with a bungee cord or wire to avoid strain on the brake line.

2. Inspect Brake Pads:

   • Check for wear indicators. If the pads are worn down to the backing plate, they need replacement.
   • If the pads are less than 3mm thick, they should be replaced regardless.

3. Inspect Brake Rotors:

   • Check for scoring, grooves, or excessive rust. If they are damaged, they may need resurfacing or replacement.
   • Use a micrometer to check rotor thickness; if it’s below specifications, replace it.

Step 4: Replace or Reinstall Parts

1. Replace Brake Pads:

   • If needed, remove the old pads and install new ones. Ensure they are seated correctly and that any anti-squeal shims are in place.

2. Resurface/Replace Rotors:

   • If the rotors are warped or damaged, either have them resurfaced or replace them.
   • Clean the new or resurfaced rotors with brake cleaner to remove any protective oils.

3. Reinstall Caliper:

   • Slide the caliper back over the new pads and rotor.
   • Torque the caliper bolts to manufacturer specifications.

Step 5: Reassemble and Test

1. Reinstall Wheel:

   • Place the wheel back on and hand-tighten the lug nuts.
   • Lower the vehicle and then torque the lug nuts to the specified setting using a torque wrench.

2. Pump the Brake Pedal:

   • Before driving, pump the brake pedal several times to ensure the pads seat properly against the rotors.

3. Test Drive:

   • Conduct a test drive to confirm the grinding noise is eliminated. Listen for any unusual sounds and check the braking feel.

Conclusion

If the grinding noise persists after replacing the brake components, further investigation into the ABS system, brake lines, or suspension components may be necessary. Always refer to the vehicle’s service manual for specific torque settings and additional diagnostic procedures. If you are uncertain, consult a professional technician for further diagnosis.