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Brake fluid flush for my 2020 Mazda6 Signature – is it necessary?

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Tom H. · rep 0 · May 22, 4:52 AM · 1 replies · solved · Question

Vehicle: 2020 Mazda6 Signature

Hey Mazda fam,

I've got a 2020 Mazda6 Signature with about 45,000 miles on it. I'm trying to stay on top of all the recommended maintenance, and I'm wondering about a brake fluid flush. My owner's manual mentions it, but I've heard some people skip it or only do it every few years.

The brakes feel fine, no sponginess or anything. Is this really a critical service, or can it be pushed back? What are the risks of not doing it? And if I do it, what kind of fluid should I be using? Thanks for the help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:52 AM

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ClearTheCode admin answer:

A brake fluid flush is indeed a critical, though often overlooked, maintenance item for your 2020 Mazda6 Signature. While your brakes may feel fine now, brake fluid degrades over time by absorbing moisture, which can significantly impact braking performance and system longevity.

Here's why it's necessary and what you need to know:

  1. Why Brake Fluid Degrades: Brake fluid is hygroscopic, meaning it absorbs moisture from the air. This moisture lowers the fluid's boiling point. When brakes are used heavily (e.g., long downhill stretches, emergency braking), the fluid can get hot enough to boil. Boiled fluid creates vapor bubbles, which are compressible, leading to a spongy pedal feel and reduced braking power – a dangerous condition known as 'brake fade'.
  2. Corrosion: The absorbed moisture also promotes corrosion within the brake lines, calipers, and ABS unit. Over time, this can lead to expensive repairs or even brake system failure.
  3. Mazda's Recommendation: Mazda typically recommends a brake fluid flush every 2 years or 30,000 miles, whichever comes first. At 45,000 miles and likely over 3 years old, your 2020 Mazda6 is definitely due for this service.
  4. Fluid Type: You must use DOT-3 or DOT-4 brake fluid that meets FMVSS 116 specifications. Mazda often specifies DOT-3, but DOT-4 is generally compatible and has a higher boiling point, offering a slight performance advantage. Never mix different types of brake fluid (e.g., DOT-3 with DOT-5) or use petroleum-based fluids.
  5. DIY vs. Shop: A brake fluid flush can be a DIY task, but it requires careful bleeding of the system to remove all air and old fluid. If not done correctly, you can introduce air into the lines, leading to a soft pedal. Given the critical safety aspect of brakes, if you're not fully confident, it's highly recommended to have a professional shop perform this service. They often have pressure bleeders that ensure a thorough job.
  6. When to See a Shop Immediately: If you notice any of the following, get your car to a shop immediately: a soft or spongy brake pedal, a brake warning light on the dashboard, or a noticeable decrease in braking performance. These could indicate a more serious issue than just old fluid.
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