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2019 718 Cayman S Brake Fluid Flush - DIY or Dealer?

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Mike T. · rep 0 · May 25, 4:53 AM · 1 replies · solved · Question

Vehicle: 2019 Porsche 718 Cayman S

My 2019 Porsche 718 Cayman S is coming up on its 2-year mark, and the service schedule indicates a brake fluid flush is due. I've done brake fluid flushes on other cars before using a pressure bleeder, but I'm wondering if there are any special considerations for the 718.

Is it a straightforward process, or are there any electronic systems (like ABS/PSM) that need specific activation or tools for bleeding? Is it something I can confidently DIY, or should I just bite the bullet and take it to the dealer?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:53 AM

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ClearTheCode admin answer:

Performing a brake fluid flush on your 2019 Porsche 718 Cayman S is a critical maintenance item, and it's commendable you're considering a DIY approach given your experience. Porsche, like most performance manufacturers, recommends a brake fluid flush every two years, regardless of mileage, due to fluid's hygroscopic nature (it absorbs moisture).

  1. Fluid Type: Always use a high-quality DOT4 brake fluid. Porsche often recommends specific brands, so check your owner's manual or a reputable Porsche parts supplier.
  2. General Process: The process is similar to other vehicles:
    • Use a pressure bleeder (recommended for Porsche for consistency and to prevent air ingress).
    • Start with the wheel furthest from the master cylinder (typically rear passenger), then rear driver, front passenger, and finally front driver.
    • Bleed until clear, new fluid comes out of each caliper.
    • Monitor the reservoir level closely to prevent it from running dry.
  3. Special Considerations for 718 Cayman S (ABS/PSM):
    • For a standard fluid flush where no air has entered the ABS/PSM module, you typically do not need a diagnostic tool to activate the ABS pump. A conventional pressure bleed is usually sufficient.
    • However, if air were to get into the ABS/PSM hydraulic unit (e.g., if the master cylinder ran dry, or if the system was opened for component replacement), then a specialized diagnostic tool (like Porsche PIWIS or an advanced aftermarket scanner) would be required to cycle the ABS pump and bleed the module properly.
    • Ensure the ignition is off during the bleeding process to prevent accidental ABS/PSM activation.
  4. DIY Confidence: Given your prior experience with pressure bleeders, you can likely confidently DIY this. The key is meticulousness and ensuring no air enters the system.

Causes of Neglect: Old, moisture-laden brake fluid can lead to a spongy pedal feel, reduced braking performance (especially under heavy use where the fluid can boil), and internal corrosion of brake components.

When to See a Shop:

  • If you're uncomfortable with the procedure or ensuring no air enters the system.
  • If the brake pedal feels spongy or unusual after the flush, indicating potential air in the system.
  • If you suspect air has entered the ABS/PSM module, as a professional tool will be needed.
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