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Spongy Brakes on my 2020 ILX - Brake Fluid Flush?

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Mike T. · rep 0 · May 25, 3:43 AM · 1 replies · solved · Question

Vehicle: 2020 Acura ILX Premium

Hey Acura forum, I've got a 2020 Acura ILX Premium with about 50,000 miles on it. Lately, the brake pedal has started to feel a bit spongy and less responsive than it used to be. It still stops the car, but it takes more pedal travel and effort. I don't see any leaks, and the fluid level in the reservoir looks okay, though it's a bit dark.

I've never had the brake fluid flushed since I bought the car new. Could this be the cause? Is a brake fluid flush a DIY job for someone with moderate mechanical skills, or should I definitely take it to a shop? What type of brake fluid does the ILX use?

Looking for some guidance on this potentially critical maintenance item!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:43 AM

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ClearTheCode admin answer:

A spongy brake pedal on your 2020 Acura ILX at 50,000 miles, especially if the fluid has never been flushed, is a classic symptom of old, contaminated brake fluid. Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This moisture lowers the fluid's boiling point, and when the brakes get hot (e.g., during heavy braking), the water can turn to steam, creating compressible pockets in the brake lines, leading to that spongy feeling.

Here's what you need to know:

  1. Brake Fluid Type: Your 2020 Acura ILX uses DOT3 or DOT4 brake fluid. DOT4 has a higher boiling point and is often recommended as an upgrade, but ensure it's compatible if mixing. Check your owner's manual or the cap on your brake fluid reservoir for the exact specification.
  2. DIY Brake Fluid Flush: This is a common DIY maintenance task, but it requires careful attention to detail to ensure no air is introduced into the system. You will need:
    • Tools: Wrench for bleed nipples, clear hose, collection bottle, fresh brake fluid, and potentially a brake bleeder kit (vacuum pump or pressure bleeder).
    • Method: The traditional method involves two people: one to pump the brake pedal and one to open/close the bleed nipples. Start with the wheel furthest from the master cylinder (typically passenger rear), then driver rear, passenger front, and finally driver front. Keep the master cylinder reservoir topped off throughout the process to prevent air from entering.
    • Watch the Fluid: Continue bleeding each caliper until clean, new fluid (clearer than the old fluid) comes out, free of air bubbles.
  3. Causes of Spongy Pedal:
    • Contaminated Fluid: As mentioned, water in the fluid is the primary cause.
    • Air in the System: If air somehow got into the brake lines (e.g., from a low fluid reservoir or previous work), it will cause a spongy pedal.
    • Worn Components: Less likely at 50k miles without other symptoms, but worn calipers, master cylinder, or brake lines could also contribute.

When to See a Shop:

  • If the pedal remains spongy after a thorough brake fluid flush and bleed.
  • If you're uncomfortable with the DIY process, as improper bleeding can lead to dangerous brake performance.
  • If you suspect a failing master cylinder, brake booster, or ABS module, which requires specialized diagnostic tools and expertise.
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