my Volvo XC90 brake pedal feels soft what’s the issue

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and engage the parking brake.
• Disconnect the battery to prevent electrical issues.

2. Inspect and Replace Brake Fluid

• Sub-steps:
  1. Remove the master cylinder cap and inspect the brake fluid. If it's contaminated or low, proceed to replace it.
  2. Use a turkey baster or suction tool to remove old brake fluid from the reservoir.
  3. Refill the master cylinder with new brake fluid (DOT 4 or as specified by manufacturer).

3. Check and Repair Brake Lines

• Sub-steps:
  1. Visually inspect all brake lines for corrosion, cracks, or leaks.
  2. If leaks are found, replace damaged sections of the brake line using a brake line repair kit.
  3. Bleed the brake system to remove air using a brake bleeder kit.

4. Replace Master Cylinder (if necessary)

• Sub-steps:
  1. Disconnect the brake lines from the master cylinder using a flare wrench.
  2. Unbolt the master cylinder from the brake booster.
  3. Install the new master cylinder by reversing the removal steps, tightening bolts to the manufacturer's specified torque value.

5. Bleed the Brake System

• Sub-steps:
  1. Starting from the furthest wheel from the master cylinder, use a brake bleeder kit to bleed each brake line until no air bubbles appear.
  2. Repeat for each wheel, ensuring brake fluid is topped up during the process.