why does my GMC Sierra shake when I brake

Learn how to diagnose and fix brake shaking issues in GMC Sierra. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.

2. Inspect and Replace Brake Components

1. Remove the Wheel:

   • Use a jack to lift the vehicle and secure it with jack stands.
   • Remove the lug nuts with a socket set and take off the wheel.

2. Inspect the Brake Rotors:

   • Check for warping by measuring with a dial indicator.
   • If warped, proceed to replace the rotors. If not, clean them with brake cleaner.

3. Inspect the Brake Pads:

   • Check the thickness of the pads. Replace if less than 3mm.
   • Remove the caliper bolts, then remove the caliper and pads.

4. Replace Rotors and Pads:

   • Install new rotors according to the manufacturer’s specifications.
   • Use proper torque values (typically 70-100 lb-ft for rotor bolts).
   • Install new brake pads and reattach the caliper.

3. Inspect Suspension Components

1. Check Wheel Bearings:

   • Jack up the vehicle and spin the wheel to check for noise or roughness.
   • If defective, replace the wheel bearings.

2. Examine Suspension Parts:

   • Inspect tie rods and control arms for wear or damage.
   • Replace any worn components as necessary.

4. Wheel Alignment

• After all components are inspected and repaired, perform a wheel alignment to ensure proper tracking.

Tools Required:

• Jack and jack stands
• Socket set
• Torque wrench
• Dial indicator
• Brake cleaner

Parts Required:

• Brake rotors
• Brake pads
• Wheel bearings (if needed)
• Suspension components (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Allow the brakes to cool before working on them.
• Always use jack stands when working underneath a vehicle.