my BMW 5 Series shakes when I'm braking what's causing this

Solution

1. Preparation

• Gather the necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.
• Use wheel chocks to prevent rolling.

2. Remove Wheel

• Using a lug wrench, loosen the lug nuts slightly while the wheel is still on the ground.
• Raise the vehicle using a jack and secure it on jack stands.
• Remove the lug nuts and take off the wheel.

3. Inspect and Replace Brake Components

• Brake Rotors:
  • Use a dial indicator to check rotor runout. If it exceeds manufacturer specifications, replace the rotor.
  • If replacing, remove the caliper bracket bolts and slide off the caliper. Then, remove the rotors.
• Brake Pads:
  • Inspect the brake pads for wear. If they are below the minimum thickness, replace them.
  • Remove the old pads and install new ones according to the manufacturer’s specifications.

4. Reassemble Components

• Reattach the rotor (if replaced) and caliper. Ensure bolts are tightened to the specified torque (typically 25-35 ft-lbs for caliper bolts).
• Reinstall the wheel and hand-tighten the lug nuts.
• Lower the vehicle and torque the lug nuts to the manufacturer's specifications (usually around 80-100 ft-lbs).

5. Test Brake System

• Pump the brake pedal to ensure proper brake pad seating.
• Conduct a test drive at low speeds to ensure vibrations have been eliminated.