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Spongy Brake Pedal on 2020 Eclipse Cross - Brake Fluid Flush Needed?

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Mike T. · rep 0 · May 25, 4:11 AM · 1 replies · solved · Question

Vehicle: 2020 Mitsubishi Eclipse Cross SEL

Hey everyone,

I've got a 2020 Mitsubishi Eclipse Cross SEL with about 45,000 miles. Lately, the brake pedal feels a bit spongy, and I have to push it down further than usual to get a firm stop. The car still brakes, but it just doesn't feel as responsive as it used to.

I've never had the brake fluid flushed or changed. Is this something that should be done at this mileage? Could old brake fluid be causing the spongy pedal feel? I'm trying to figure out if this is a DIY job or if I should take it to the dealership.

No warning lights on the dash, and the fluid reservoir looks full, but I can't tell its condition.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:11 AM

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ClearTheCode admin answer:

Your observation of a spongy brake pedal on your 2020 Mitsubishi Eclipse Cross at 45,000 miles, coupled with never having the brake fluid flushed, points strongly towards degraded brake fluid as a potential cause. Brake fluid is hygroscopic, meaning it absorbs moisture over time, which can significantly impact braking performance and safety.

Here’s why and what to do:

  1. Brake Fluid Degradation: As brake fluid absorbs moisture, its boiling point decreases. When you brake hard, the heat generated can cause this moisture to boil, creating vapor bubbles in the brake lines. Unlike fluid, vapor is compressible, leading to that characteristic spongy pedal feel.
  2. Recommended Flush Interval: Mitsubishi, like most manufacturers, typically recommends a brake fluid flush every 2-3 years or 30,000-45,000 miles, whichever comes first. At 45,000 miles and likely 3-4 years old, your Eclipse Cross is definitely due for this critical maintenance.
  3. Causes of Spongy Pedal:
    • Contaminated/Old Brake Fluid: As explained above, moisture absorption is the primary culprit.
    • Air in the Brake Lines: Can occur after brake component replacement or if fluid levels drop too low.
    • Worn Brake Components: Though less likely to cause a spongy pedal directly, worn calipers, master cylinder, or brake lines could contribute.
  4. DIY vs. Professional:
    • DIY: A brake fluid flush can be a DIY job, but it requires specific tools (e.g., a pressure bleeder or vacuum bleeder) and careful attention to detail to ensure no air enters the system. It's crucial to use the correct DOT-rated brake fluid (DOT3 or DOT4, check your owner's manual).
    • Professional: If you're not experienced, it's highly recommended to have a professional perform the flush. They have the right equipment to effectively purge all old fluid and air, ensuring optimal braking performance and safety. This is a critical safety system, so don't cut corners.

Addressing this issue promptly is vital for your safety and the longevity of your braking system components.

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