why does my Volvo XC60 First Generation (2008-2017) brake pedal feel spongy when pressed

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Wear safety glasses and gloves for protection.

2. Inspect and Replace Brake Fluid

• Sub-steps:
  • Remove the brake fluid reservoir cap.
  • Check the condition of the brake fluid; if it appears dark or contaminated, it should be replaced.
  • Use a brake fluid syringe to extract old fluid and refill with fresh DOT 4 brake fluid.
• Tools Required: Brake fluid syringe, funnel.

3. Check and Repair Brake Lines

• Sub-steps:
  • Visually inspect all brake lines for signs of wear, corrosion, or damage.
  • If leaks are found, replace the affected brake line(s) with new ones.
  • Tighten any loose fittings to prevent further leaks.
• Tools Required: Wrench set, line cutter, flare tool.

4. Bleed the Brake System

• Sub-steps:
  • Begin at the furthest brake from the master cylinder (usually the right rear).
  • Attach a clear plastic tube to the bleeder valve on the brake caliper.
  • Open the bleeder valve and have an assistant press the brake pedal down slowly.
  • Close the bleeder valve before the pedal reaches the floor and repeat until no air bubbles appear in the fluid.
  • Move to the next wheel and repeat the process until all wheels are bled.
• Tools Required: Bleeder kit, clear tubing, wrench.

5. Test Brake System

• Sub-steps:
  • After bleeding, check the brake fluid level and top off if necessary.
  • Start the engine and press the brake pedal to ensure it feels firm.
  • Conduct a test drive at low speeds to ensure brakes function correctly without any sponginess.
• Tools Required: None.