why does my Volvo XC60 First Generation (2008-2017) brake pedal feel spongy and goes to the floor

Solution

1. Preparation

• Gather tools and parts:
  • Tools: Socket set, brake bleeder kit, torque wrench, fluid catch container
  • Parts: Brake fluid, new brake lines or hoses (if needed), brake pads (if worn)
• Ensure the vehicle is parked on a flat surface and securely supported.

2. Brake Fluid Inspection

• Remove the master cylinder cap and check the fluid level.
  • If low, top up with the appropriate brake fluid (DOT 4 for Volvo vehicles).
• Inspect the fluid for contamination (dark color or debris).

3. Brake Line and Hose Inspection

• Visually inspect all brake lines and hoses for leaks or signs of wear.
• If any hoses are cracked or swollen, replace them.
  • To replace, use a line wrench to disconnect the old hose and install the new one, ensuring proper torque.

4. Brake Pad and Rotor Condition

• Remove the wheel to access the brake assembly.
• Check the thickness of the brake pads and the condition of the rotors.
  • Replace pads if they are worn below the minimum thickness (usually 3mm).
• If rotors are warped or below specification, replace them as well.

5. Bleeding the Brakes

• Connect the brake bleeder kit to the brake caliper.
• Have an assistant pump the brake pedal several times and hold it down.
• Open the bleeder valve to release air and old fluid, then close it before the pedal is released.
• Repeat until fluid runs clear, ensuring no air bubbles are present.
• Always start from the wheel farthest from the master cylinder (right rear, left rear, right front, left front).