my Skoda Octavia's brakes feel spongy what's causing this

Solution

1. Preparation

• Gather tools and materials needed.
• Ensure the vehicle is parked on a level surface with the parking brake engaged.
• Wear safety goggles and gloves.

2. Inspect and Replace Brake Fluid

• Tools Required: Brake fluid, funnel, clean cloth.
• Check the brake fluid level; if low, top off with the recommended brake fluid (DOT 4).
• If the fluid appears dirty or contaminated, proceed to replace it.
• To replace, open the brake fluid reservoir cap.
• Using a turkey baster or similar tool, remove old fluid from the reservoir.
• Fill the reservoir with new brake fluid.
• Bleed the brake system to remove air (see step 3).

3. Bleed Brake System

• Tools Required: Brake bleeder kit or clear tubing, container for old fluid.
• Start at the wheel farthest from the master cylinder (usually the right rear wheel).
• Attach the tubing to the bleeder screw on the brake caliper and place the other end in a container.
• Have an assistant press the brake pedal several times and hold it down.
• Open the bleeder screw to allow old fluid and air to escape, then close it before the pedal is released.
• Repeat this process until you see clean fluid without bubbles, then tighten the bleeder screw.
• Move to the next wheel in the order: left rear, right front, and finally left front.

4. Inspect and Replace Brake Components

• Tools Required: Socket set, torque wrench, brake pads and rotors (if required).
• Remove the wheel to access the brake caliper.
• Inspect pads and rotors for wear; replace if pads are below the minimum thickness or if rotors are scored.
• Remove the caliper bolts, and carefully remove the caliper.
• Replace pads and rotors as necessary, reassembling in reverse order.
• Torque caliper bolts to manufacturer specifications.

5. Final Assembly

• Reinstall the wheels and lower the vehicle.
• Check brake fluid level again and top off if necessary.
• Ensure all tools are removed from the work area.