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Spongy Brakes on 2017 Q60 - Time for a Brake Fluid Flush?

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Robert C. · rep 0 · May 22, 5:08 AM · 1 replies · solved · Question

Vehicle: 2017 Infiniti Q60 Red Sport 400

My 2017 Infiniti Q60 Red Sport with around 65,000 miles has recently developed a somewhat spongy brake pedal feel. It doesn't feel as firm as it used to, and I feel like I have to press it further to get the same stopping power. I haven't noticed any leaks, and the brake pads and rotors were replaced about 15k miles ago.

I'm wondering if it's time for a brake fluid flush. What's the recommended interval for brake fluid on these cars, and is it a DIY job or something best left to a professional?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:08 AM

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ClearTheCode admin answer:

  1. Likely Cause: Contaminated Brake Fluid: A spongy brake pedal, especially without visible leaks or recent brake component issues, is a classic symptom of old, moisture-laden brake fluid. Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time.
  2. Why It's Important: Water in the brake fluid lowers its boiling point. During heavy braking, the fluid can boil, creating vapor bubbles in the lines. Unlike fluid, vapor is compressible, leading to that 'spongy' feeling and reduced braking effectiveness. It also causes internal corrosion in brake components like the master cylinder, calipers, and ABS module.
  3. Recommended Interval: Infiniti, like most manufacturers, typically recommends a brake fluid flush every 2-3 years or 30,000 to 45,000 miles, whichever comes first. At 65,000 miles on a 2017 model, if it hasn't been done, you are well overdue.
  4. DIY vs. Professional: A brake fluid flush can be a DIY job, but it requires careful attention to detail to ensure no air enters the system and that all old fluid is expelled. You'll need a friend to pump the pedal, or a pressure/vacuum bleeder, and the correct DOT 3 or DOT 4 brake fluid (check your owner's manual). If done incorrectly, you could introduce air, making the problem worse or even rendering your brakes ineffective. For safety, many prefer to have this done by a professional.
  5. When to See a Shop: If the spongy feeling is severe, if the brake pedal goes to the floor, or if you notice any warning lights (like the ABS or brake warning light), do not drive the vehicle. Have it towed to a professional mechanic immediately for a thorough inspection. These could indicate a more serious issue with the master cylinder or other hydraulic components.
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