my Skoda Octavia's brake pedal feels soft, what should I check

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Engage the parking brake for safety.
• Wear safety gloves and goggles.

2. Check Brake Fluid Level

• Locate the master cylinder reservoir, typically near the driver's side.
• Remove the cap and check the fluid level; it should be between the "MIN" and "MAX" marks.
• If low, top up with the manufacturer-recommended brake fluid (DOT 4 or DOT 3 as specified).

3. Inspect Brake Lines and Components

• Visually inspect brake lines, hoses, calipers, and wheel cylinders for any signs of leaks or damage.
• If leaks are found, replace the damaged components immediately.

4. Bleed the Brake System

• Use a brake bleeder kit or another person to assist.
• Start with the wheel farthest from the master cylinder (usually the right rear).
  • Attach the bleeder hose to the bleed valve on the brake caliper.
  • Open the valve and have an assistant press the brake pedal several times.
  • Close the valve before the pedal is released to prevent air from entering.
• Repeat for the left rear, right front, and left front wheels in that order.
• Check fluid levels frequently to avoid running low during bleeding.

5. Inspect the Brake Master Cylinder

• If soft pedal persists, remove the master cylinder from the brake booster.
• Check for fluid leaks at the back of the cylinder and signs of wear internally.
• Replace the master cylinder if leaks are found or if internal failure is suspected.

6. Check the Brake Booster

• With the engine running, press the brake pedal; it should feel firm.
• If the pedal feels hard with the engine off but soft with it running, the brake booster may be faulty.
• Replace the brake booster if necessary.