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2017 Model S Brake Fluid Flush - Is it Necessary?

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David L. · rep 0 · May 22, 5:26 AM · 1 replies · solved · Question

Vehicle: 2017 Tesla Model S 75D

Hi everyone,

I own a 2017 Tesla Model S 75D, and it's approaching its 6-year mark. I've been pretty good about keeping up with tire rotations and general checks, but I'm wondering about brake fluid. With regenerative braking doing most of the work, I don't use the friction brakes as much as I would in a traditional ICE car.

Does a Tesla still need regular brake fluid flushes? If so, what's the recommended interval for a 2017 Model S? Is this something I can check myself, or is it strictly a service center job? I want to make sure I'm not neglecting any critical maintenance for safety.

Thanks for any advice!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:26 AM

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ClearTheCode admin answer:

That's a great question, David, and a common one for Tesla owners! While regenerative braking significantly reduces wear on your friction brakes, brake fluid maintenance is still crucial for your 2017 Model S 75D.

Causes for Brake Fluid Maintenance:

  1. Moisture Absorption: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This lowers its boiling point, which can lead to brake fade under heavy use (though less common in EVs, it's still a safety risk).
  2. Corrosion: Water in the brake fluid can also cause internal corrosion in brake lines and components, potentially leading to costly repairs.
  3. Contamination: Over time, small particles and debris can accumulate in the fluid.

Tesla's Recommendations: Tesla generally recommends checking the brake fluid level and condition during routine service appointments. While they don't always specify a rigid mileage interval for a full flush, a common recommendation for brake fluid replacement is every 2 years or 25,000 miles, whichever comes first, especially in humid climates. Some service centers might recommend it based on fluid testing.

When to See a Shop:

  • Highly Recommended: Brake fluid flushing is generally not a DIY job for most owners, especially with modern ABS/stability control systems. It requires specialized tools (pressure bleeder) and knowledge to ensure all air is purged and the system is properly bled without introducing new issues.
  • Service Alerts: If you receive any in-car service alerts related to your brake system (e.g., 'Brake System Fault', 'Low Brake Fluid'), you should immediately schedule service. Do not attempt to top off the fluid yourself without professional diagnosis, as a low level often indicates a leak.

Steps a Shop Will Take:

  1. Fluid Test: They may test the existing fluid for moisture content.
  2. Flush: The old fluid is systematically flushed out of the system, starting from the wheel furthest from the master cylinder, and replaced with new, clean DOT 3 or DOT 4 brake fluid (check your owner's manual for the specific type).
  3. Bleed: The system is bled to remove any air bubbles, ensuring proper brake pedal feel and function.

Ensuring your brake fluid is in good condition is vital for the safety and longevity of your braking system, even with regenerative braking.

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