How to Flush Brake Fluid on a Porsche Cayenne

Maintenance Interval 2 Years
Estimated Dealer Cost $350
Estimated Independent Mechanic Cost $200
Estimated DIY Cost $40
Repair Time 1.5 hours
DIY Difficulty Easy

Brake fluid is a critical component to your vehicle’s braking system. When you press the brake pedal, the brake fluid transfers the pressure to your brake calipers and presses the brake pads against the rotors. Over time, the brake fluid can absorb air and moisture, which will allow the brake fluid to compress under pressure. This results in spongy and even ineffective braking.

Overall, this is an easy procedure that someone with some experience working on cars can do. To perform this DIY, check out the helpful tutorial above from YouTuber, CarFanatic. While the video covers the procedure on a Porsche 911, the steps for the Cayenne are virtually the same. Detailed steps can be found below.

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Torque Specs & Fluid Capacities:

Wheel bolts: 118 ft-lbs
Brake fluid capacity: 0.95 liters
Brake bleeder valve: 7.5 ft-lbs (or just hand tighten until snug)

Step-by-Step Instructions:

Step 1: Prepare your vehicle and work area.

  • Park your car on a flat surface.
  • Gather tools and parts.
  • Put on eye protection and gloves.

Step 2: Setup the power brake pressure bleeder.

  • ​Fill it with 1.8 liters of brake fluid; save the 0.2 liter of fluid to top off your reservoir at the end.
  • Then pressurize it to 15 psi.
  • Save your extra 

Step 3: Connect the power brake bleeder to your brake fluid reservoir.

  • Open the hood.
  • As shown in the video from NoneMechanic101, remove a plastic panel on the left-hand side of the vehicle towards the windshield cowl to reveal the brake fluid reservoir. While the video is for a VW Touareg, the brake fluid reservoir is in the same location on the Cayenne.
  • Unscrew brake fluid reservoir cap and remove mesh filter; you DO NOT need to extract brake fluid from the reservoir.
  • Screw on the power brake bleeder adapter onto the brake fluid reservoir.
  • Connect the power brake bleeder to the adapter using the supplied hose and fitting.

Step 4: Prepare to bleed each brake caliper in the following order.

  • Start with the rear passenger side and drain: 0.5 liter (split 50/50 for outer & inner nipples)
  • Move to the rear driver side and drain: 0.5 liter (split 50/50 for outer & inner nipples)
  • Move to the front passenger side and drain: 0.3 liter (split 50/50 for outer & inner nipples)
  • Finish off with the front driver side and drain: 0.3 liter  (split 50/50 for outer & inner nipples)
  • Note: While the brake fluid capacity is only 0.95 liters, we recommend bleeding more fluid just to make sure you remove all the old fluid.

Step 5: Remove your wheels.

  • You will need to remove your wheels to access the brake calipers.
  • As shown in the video, we recommend you lift one corner at a time.
  • Note: If your vehicle has air suspension, you will need to disable the self-leveling feature. With key in the “ON” position, hold the air suspension button up for 10 seconds until the indicator appears on the gauge cluster.
  • Before you lift your car, be sure to chock off the wheels on the opposite side to prevent your car from rolling.
  • Use a 19mm lug nut socket and breaker bar to break loose the wheel bolts; do not remove them yet.
  • Jack the corner you will be working on up, place a jack stand underneath on the approved jack point location, then lower the jack until your vehicle sits securely on the jack stand.
  • Give your vehicle a shove to make sure it is secure.
  • Remove the wheel bolts, then remove the wheel; we recommend you use two wheel guide bolts to make removing and reinstalling the wheel easier.

Step 6: Bleed each brake caliper.

  • Drain the outer and inner brake caliper nipples by connecting the catch can and loosening the nipples with an 11mm wrench.
  • Monitor how much brake fluid you are collecting, so you don’t drain too much.
  • Once you’ve drained enough fluid from each nipple, tighten it to stop the flow of brake fluid; DO NOT OVER-TIGHTEN the brake caliper nipples or you can easily brake them. The nipples just need to be snug.
  • Re-install the wheel and torque it to 118 ft-lbs.
  • Repeat these steps for each brake caliper.

Step 7: Lower your vehicle.

  • Remove the jack stands.
  • Remove the wheel chocks.

Step 8: Top off your brake fluid reservoir.

  • Depressurize the power brake bleeder and disconnect it from the brake fluid reservoir.
  • Remove power brake bleeder adapter from the brake fluid reservoir.
  • Top off the brake fluid reservoir with the remaining fresh brake fluid to get the level just under the “max” line.
  • Re-install the brake fluid reservoir filter, cap, and plastic cover.

Step 9: Clean up your work area.

  • Empty your old brake fluid into the now empty brake fluid container.
  • DO NOT dispose of your old brake fluid by pouring it out or putting it in the trash; brake fluid is extremely corrosive and bad for the environment, so be sure to take the old fluid to your local auto parts store for recycling.
  • Put all of your tools and supplies back where they belong.
  • You’re all done!

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