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2019 Murano - Spongy Brake Pedal - Time for a Brake Fluid Flush?

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David L. · rep 0 · May 22, 2:53 AM · 1 replies · solved · Question

Vehicle: 2019 Nissan Murano Platinum

Hi everyone,

I own a 2019 Nissan Murano Platinum with about 55,000 miles on it. Lately, I've noticed that the brake pedal feels a bit spongy, and I have to press it down further than before to get the same braking power. There are no warning lights on the dash, and the brakes aren't making any strange noises. The pads and rotors were replaced about 15,000 miles ago.

I'm wondering if this could be a sign that the brake fluid needs to be flushed. I don't think it's ever been done since I bought the car new. What's the recommended interval for a brake fluid flush on a Murano? Is this something a DIYer can tackle, or is it better left to a professional due to the ABS system?

Any advice on this would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:53 AM

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ClearTheCode admin answer:

A spongy brake pedal is a classic symptom that often points to air in the brake lines or, more commonly, degraded brake fluid. Given your 2019 Murano's mileage and the fact that the fluid hasn't been flushed, this is a very strong candidate for your issue.

  1. Brake Fluid Degradation: Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This moisture lowers the fluid's boiling point. When brakes get hot (during heavy braking or normal use), this moisture can turn to vapor, creating compressible air pockets in the lines, which leads to a spongy pedal feel.
  2. Recommended Flush Interval: Nissan generally recommends inspecting brake fluid at every service and replacing it every 2-3 years or 30,000-45,000 miles, whichever comes first. At 55,000 miles and 5 years, your fluid is definitely due for replacement.
  3. DIY vs. Professional Flush:
    • DIY: A brake fluid flush can be a DIY job, but it requires careful attention and often a second person to pump the brakes while you open and close bleed valves. You'll need specific tools like a brake bleeder kit, clear tubing, and a collection bottle. It's crucial to prevent air from entering the system and to use the correct DOT-rated fluid (usually DOT 3 or DOT 4 for your Murano – check your owner's manual or master cylinder cap).
    • ABS System Considerations: Modern vehicles with ABS and stability control systems can sometimes be more complex. While a standard bleed procedure usually works, some systems (especially if the ABS module itself needs bleeding) might require a diagnostic scan tool to cycle the ABS pump. For a routine fluid flush, this is rarely necessary unless the system has been completely drained or the ABS module was replaced.
  4. Causes of Spongy Pedal:
    • Degraded Brake Fluid: Most common cause, as explained above.
    • Air in the Lines: Can happen after brake component replacement if not bled properly, or if fluid levels drop too low.
    • Failing Master Cylinder: Less common, but an internal leak in the master cylinder can cause a spongy pedal. This usually worsens over time and might cause the pedal to slowly sink to the floor.
    • Brake Line Issues: Leaks in brake lines or calipers, though these would typically cause a visible fluid leak and a dropping fluid level.
  5. When to See a Shop: If you're not confident in performing a brake fluid flush, or if the spongy pedal persists after a thorough flush, it's best to take your Murano to a professional mechanic. They can use specialized equipment to ensure a complete flush and diagnose any underlying issues with the braking system.
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