why does my Volvo XC90's brake pedal feel soft

Solution

1. Preparation

• Gather tools and parts: brake fluid, brake line wrench, vacuum bleeder (if needed), and safety gloves.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Remove the wheel to access the brake components if necessary.

2. Check Brake Fluid

• Remove the brake fluid reservoir cap.
• Inspect fluid for clarity; if it appears dark or contaminated, proceed to flush the brake system.
• If the fluid level is low, top it off with the manufacturer-recommended brake fluid.

3. Bleed the Brake System

• Begin at the wheel farthest from the master cylinder (usually the rear right).
• Attach a clear hose to the bleeder valve and place the other end in a container to catch fluid.
• Open the bleeder valve and have an assistant pump the brake pedal several times, then hold it down while you close the valve.
• Repeat until no air bubbles appear in the fluid; check fluid level in the reservoir frequently.
• Move to the next wheel (rear left, then front right, then front left) and repeat the process.

4. Inspect and Repair Brake Lines

• Check for leaks in the brake lines and connections.
• If a leak is found, replace the damaged section of the brake line.
• Ensure all connections are tight and secure to prevent future leaks.

5. Test Brake Booster

• With the engine running, press the brake pedal several times to check for firmness.
• If the pedal remains soft, the brake booster may need replacement.