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Spongy Brake Pedal on 2019 Traverse - Time for a Brake Fluid Flush?

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Sarah K. · rep 0 · May 22, 2:38 AM · 1 replies · solved · Question

Vehicle: 2019 Chevrolet Traverse Premier

Hello ClearTheCode community,

I own a 2019 Chevrolet Traverse Premier with about 55,000 miles on it. Lately, I've noticed that my brake pedal feels a bit spongy, and I have to press it down further than usual to get a firm stop. The braking performance itself seems okay, but the pedal feel is definitely off. There are no warning lights on the dash, and I don't hear any strange noises when braking.

I'm wondering if this could be a sign that it's time for a brake fluid flush. I haven't had one done since I bought the car new. What's the recommended interval for brake fluid changes on these vehicles, and could old fluid really cause a spongy pedal? Any other ideas for what might be causing this?

Thanks in advance for your help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:38 AM

0

ClearTheCode admin answer:

A spongy brake pedal on your 2019 Chevrolet Traverse Premier at 55,000 miles, without any warning lights or noises, is a strong indicator that a brake fluid flush is overdue. Brake fluid is hygroscopic, meaning it absorbs moisture over time. This moisture lowers the fluid's boiling point and can lead to a spongy pedal feel, especially under heavy braking, as the water vaporizes and creates compressible pockets in the hydraulic system.

Chevrolet generally recommends a brake fluid flush every 2-3 years or 30,000-45,000 miles, whichever comes first, depending on driving conditions and specific model recommendations. Since your vehicle is 5 years old and has 55,000 miles, it's definitely time.

Here's why a flush helps and what else to consider:

  1. Moisture Removal: A flush replaces old, moisture-laden fluid with fresh, dry fluid, restoring the system's hydraulic integrity and firm pedal feel.
  2. Corrosion Prevention: Old fluid can also lead to internal corrosion in brake lines, calipers, and the master cylinder. Fresh fluid helps prevent this.
  3. Proper Bleeding: Ensure the system is properly bled after the flush to remove any air bubbles, which can also cause a spongy pedal.

Causes of a spongy pedal:

  • Contaminated/Old Brake Fluid: (Most likely in your case).
  • Air in the Brake Lines: Can happen after brake component replacement or if the fluid level gets too low.
  • Failing Master Cylinder: Less likely without other symptoms like fluid loss or a pedal slowly sinking to the floor.
  • Worn Brake Calipers/Wheel Cylinders: Internal seals can fail, but usually accompanied by fluid leaks or uneven braking.
  • Damaged Brake Hoses: Swelling or deterioration of flexible brake hoses can cause a spongy feel.

When to see a shop:

  • If the spongy pedal persists after a thorough brake fluid flush and proper bleeding.
  • If you notice any brake fluid leaks around the wheels or master cylinder.
  • If the brake pedal slowly sinks to the floor when held down, which indicates a failing master cylinder.
  • If you're uncomfortable performing a brake fluid flush yourself, as it requires specific procedures to ensure all air is removed and the correct fluid type (DOT 3 or DOT 4, check your owner's manual) is used.
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