how to fix the brake pedal going to the floor in Porsche Cayenne E3 (2018-Present)

Solution

1. Preparation

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

2. Inspect and Repair Brake Lines

• Tools Required: Line wrenches, brake line flaring tool, replacement brake line (if needed).
• Inspect all brake lines for corrosion or damage. Replace any damaged lines.
• If a line needs replacing, use the line wrench to disconnect it from the caliper and master cylinder.
• Measure and cut the new brake line to the required length, then flare the ends as necessary.
• Install the new line, ensuring all connections are tight but not over-torqued.

3. Check and Replace Brake Fluid

• Tools Required: Brake fluid and a funnel.
• If the brake fluid is low or contaminated, remove the reservoir cap and fill it with the appropriate brake fluid (DOT 3 or DOT 4 as specified by Porsche).
• Replace the reservoir cap securely.

4. Bleed the Brake System

• Tools Required: Brake bleeder kit or clear tubing and a catch container.
• Start with the wheel farthest from the master cylinder (usually the right rear).
• Attach the clear tubing to the bleeder screw on the brake caliper and submerge the other end in a catch container.
• Have an assistant pump the brake pedal several times and hold it down. Open the bleeder screw to allow fluid to escape, then close it before releasing the pedal.
• Repeat this process until no air bubbles are present in the fluid. Move to the next farthest wheel and repeat until all brakes are bled.

5. Inspect and Replace Master Cylinder (if necessary)

• Tools Required: Socket set, torque wrench, replacement master cylinder (if needed).
• If the master cylinder is found to be faulty during diagnostics, remove it by disconnecting the brake lines and unbolting it from the brake booster.
• Install the new master cylinder and torque bolts to manufacturer's specifications.
• Reconnect brake lines and ensure no leaks.