why does my Porsche Cayenne E3 (2018-Present) brake pedal feel soft

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and securely engage the parking brake.
• Wear safety gloves and goggles.

2. Check and Refill Brake Fluid

• Sub-steps:
  1. Open the hood and locate the brake fluid reservoir.
  2. Remove the cap and inspect the fluid level; it should be between the "MIN" and "MAX" marks.
  3. If low, use the manufacturer's recommended brake fluid (e.g., DOT 4) to refill to the appropriate level.

Tools Required: None

3. Inspect for Leaks

• Sub-steps:
  1. Visually inspect brake lines, calipers, and the master cylinder for signs of fluid leakage.
  2. If leaks are found, identify the source and proceed to replace or repair the affected components.

Tools Required: Wrench set, possibly a brake line flaring tool.

4. Bleed the Brake System

• Sub-steps:
  1. Begin at the furthest brake caliper from the master cylinder (usually the passenger side rear).
  2. Attach a clear hose to the bleeder screw and place the other end in a catch bottle.
  3. Have an assistant press the brake pedal several times and hold it down while you loosen the bleeder screw.
  4. Tighten the screw, then allow the assistant to release the pedal. Repeat until fluid runs clear and free of air bubbles.
  5. Repeat for each caliper in the order: passenger rear, driver rear, passenger front, driver front.

Tools Required: Brake bleeder kit, wrench for bleeder screws.

5. Replace Brake Components (if necessary)

• Sub-steps:
  1. If pads or rotors are worn, remove the wheel and caliper.
  2. Replace the pads and/or rotors according to manufacturer specifications.
  3. Reinstall the caliper, ensuring proper torque settings (usually 30-50 Nm for caliper bolts).

Tools Required: Socket set, torque wrench.