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Spongy Brakes on 2021 G70 3.3T - Time for a Brake Fluid Flush?

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Mike T. · rep 0 · May 25, 4:38 AM · 1 replies · solved · Question

Vehicle: 2021 Genesis G70 3.3T

Hey Genesis crew, I've got a 2021 Genesis G70 3.3T and lately, the brake pedal has been feeling a bit spongy. It doesn't feel as firm or responsive as it used to, and I'm wondering if it's time for a brake fluid flush.

The car has about 40,000 miles on it, and I haven't had the brake fluid changed yet. I do some spirited driving occasionally, but nothing extreme like track days. No warning lights are on, and the car still stops, but the confidence just isn't there.

Is this a common issue around this mileage? Can I DIY a brake fluid flush, or is it something I should definitely take to the dealership or a specialized shop? Any specific brake fluid recommendations for the G70 3.3T's Brembo setup?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:38 AM

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ClearTheCode admin answer:

A spongy brake pedal on your 2021 Genesis G70 3.3T at 40,000 miles is a strong indicator that a brake fluid flush is due. Brake fluid is hygroscopic, meaning it absorbs moisture over time, which lowers its boiling point and can lead to a spongy pedal feel, especially under spirited driving conditions where brake temperatures rise.

Here's what you need to know:

  1. Brake Fluid Degradation:

    • Moisture absorption is the primary culprit. Water in the fluid can boil, creating compressible vapor bubbles that lead to a spongy pedal. It also causes internal corrosion in brake components.
    • Over time, brake fluid also accumulates contaminants and loses its effectiveness.

  2. Recommended Interval:

    • Most manufacturers, including Genesis, recommend a brake fluid flush every 2 years or 30,000 miles, regardless of mileage, due to moisture absorption. Your 40,000 miles and 3 years (assuming a 2021 model) definitely put you in the service window.

  3. DIY vs. Professional:

    • DIY: A brake fluid flush can be a DIY task, but it requires proper tools (bleeder wrench, clear tubing, collection bottle, possibly a pressure bleeder or a helper for two-person bleeding) and careful attention to detail. It's crucial to prevent air from entering the system.
    • Professional: Given the G70 3.3T's performance braking system (Brembo), a professional flush is often recommended. Shops have specialized equipment to ensure all old fluid is removed and the system is properly bled, sometimes using a diagnostic tool to cycle the ABS pump for a complete flush.

  4. Fluid Type:

    • For your G70 3.3T with Brembo brakes, you'll need a high-quality DOT4 brake fluid. Always check your owner's manual for the exact specification. Brands like Motul RBF600 or ATE TYP 200 are popular choices for performance applications, but any quality DOT4 fluid meeting the Genesis spec will work.

  5. When to See a Shop:

    • If you're uncomfortable with the DIY process or don't have the right tools.
    • If the spongy pedal persists after a DIY flush.
    • If you notice any leaks, grinding noises, or the brake warning light comes on, indicating a more serious issue.
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