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How to flush brake fluid on a Porsche Boxster / Cayman (2005-2012)

Maintenance Interval: Every 2 years regardless of mileage

Dealer Cost: ~$250

DIY Cost: ~$20 (after initial purchase of tools)

Difficulty: Easy 

Repair Time: 1.5 hours

Overview:

Over time, brake fluid can absorb moisture and  air can get into the system, which will result in more spongy braking. Every 2 years, Porsche recommends replacing your vehicle's brake fluid. 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 procedure is virtually identical on the Porsche Boxster and Cayman. Detailed steps can be found below.

These service instructions apply to:

  • 2005-2012 Porsche Cayman (all models)

  • 2005-2012 Porsche Boxster (all models)

Instructions:

  1. Gather tools and parts.
     

  2. Setup the power brake pressure bleeder.

    1. ​Fill it with 0.9 liter of brake fluid; save the 0.1 liter of fluid to top off your reservoir at the end.

    2. Then pressurize it to 15 psi.
       

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

    1. Pop your vehicle's front storage compartment (aka "frunk").

    2. Remove a plastic panel on the driver side to access the brake fluid reservoir.

    3. Unscrew brake fluid reservoir cap and remove mesh filter; you DO NOT need to extra brake fluid from the reservoir.

    4. Screw on the power brake bleeder adapter onto the brake fluid reservoir.

    5. Connect the power brake bleeder to the adapter using the supplied hose and fitting
       

  4. Next proceed to bleed each brake caliper in THIS EXACT ORDER and drain the following amounts:

    1. Rear passenger side - 0.3 liter (split 50/50 for outer & inner nipples)

    2. Rear driver side - 0.25 liter (split 50/50 for outer & inner nipples)

    3. Front passenger side - 0.15 liter (split 50/50 for outer & inner nipples)

    4. Front driver side - 0.1 liter  (split 50/50 for outer & inner nipples)
       

  5. To bleed your brake caliper, follow these steps:

    1. You will need to remove your wheels to access the brake calipers. Either jack up the entire car and remove all 4 wheels or remove one wheel at a time while you do each corner.

    2. Drain the outer and inner brake caliper nipples by connecting the catch can and loosening the nipples with an 11mm wrench.

    3. When you are done draining a nipple, hand tighten the nipple. DO NOT OVER-TIGHTEN! THESE SHOULD BE ONLY SNUG.
       

  6. After draining each caliper, put your wheels back on and get the vehicle back on the ground. 
     

  7. Depressurize the power brake bleeder and disconnect it from the brake fluid reservoir.
     

  8. Top off the brake fluid reservoir as needed to get the level just under the "max" line.
     

  9. Re-install the brake fluid reservoir filter, cap, and plastic cover.
     

  10. Clean-up and put return all of your tools and supplies.
     

  11. You're all done!

Step 1 - Gather tools & parts