my Volkswagen Golf MK5 (2004-2008) has a hard brake pedal, what could be the issue?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is on a flat surface and securely supported with jack stands.
• Disconnect the negative battery terminal to prevent any electrical issues.

2. Check and Replace Brake Fluid

• Sub-steps:
  1. Remove the brake fluid reservoir cap.
  2. Inspect fluid quality; if dirty or contaminated, proceed to replace.
  3. Use a brake bleeder kit to flush old fluid from the system.
  4. Refill with manufacturer-recommended brake fluid (DOT 4).
• Tools Required: Brake bleeder kit, wrench for bleeder screws, clean containers.

3. Inspect and Replace Brake Booster (if faulty)

• Sub-steps:
  1. Disconnect the vacuum line from the brake booster.
  2. Unbolt the brake booster from the firewall (typically 4-5 bolts).
  3. Remove the master cylinder from the brake booster (unbolt and carefully pull apart).
  4. Install the new brake booster by reversing the removal steps.
  5. Reconnect the vacuum line ensuring a tight fit.
• Tools Required: Socket set, wrench set.

4. Inspect Vacuum Line

• Sub-steps:
  1. Visually inspect the vacuum line for any visible damage or wear.
  2. Replace any damaged sections of the vacuum line with a new line of the same diameter.
  3. Ensure all connections are secure and leak-free.
• Tools Required: Cutting tool for hose, clamps if necessary.