why is my Volvo XC90 brake pedal going to the floor

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
• Wear safety gloves and goggles.

2. Check and Refill Brake Fluid

• Locate the master cylinder reservoir.
• Remove the cap and check the fluid level; if low, top off with the manufacturer-recommended brake fluid (DOT 3 or DOT 4).
• Inspect for any signs of contamination or discoloration in the fluid.

3. Inspect and Repair Leaks

• Visually inspect all brake lines, connections, and fittings for signs of fluid leaks.
• If leaks are found, replace damaged lines or fittings. Use a line wrench to avoid damaging the fittings.
• Replace any leaking calipers or wheel cylinders as necessary.

4. Brake Master Cylinder Replacement (if needed)

• Disconnect the brake lines from the master cylinder using a line wrench.
• Remove the master cylinder mounting bolts and carefully pull it off.
• Install the new master cylinder, ensuring it aligns properly.
• Reconnect the brake lines and torque to manufacturer specifications.

5. Bleed the Brake System

• Begin at the wheel farthest from the master cylinder (usually the right rear).
• Use a brake bleeder kit or a helper to pump the brake pedal while you open and close the bleeder valve on each wheel until no air bubbles appear.
• Repeat the process for all wheels, moving closer to the master cylinder.