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

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Mike T. · rep 0 · May 25, 1:42 AM · 1 replies · solved · Question

Vehicle: 2019 Chevrolet Traverse LT

My 2019 Chevrolet Traverse LT (3.6L V6) has developed a really spongy brake pedal lately. It feels like I have to push the pedal much further down than before to get the same braking power, and it just doesn't feel firm at all. There are no warning lights on the dash, and I don't hear any grinding or squealing that would indicate worn pads.

The car has about 60,000 miles on it, and I've never had the brake fluid changed or flushed. I've heard that brake fluid can absorb moisture over time, leading to a spongy pedal. Could this be the culprit?

Is a brake fluid flush something a DIYer can do, or is it best left to a professional? What kind of brake fluid should I use for this model?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:42 AM

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ClearTheCode admin answer: A spongy brake pedal on your 2019 Chevrolet Traverse LT at 60,000 miles, without other symptoms, is a strong indicator that your brake fluid is due for a flush. Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. This moisture lowers the fluid's boiling point and can lead to corrosion within the brake system.

Here's what you should know and do:

  1. Brake Fluid Degradation:

    • Water contamination in brake fluid can boil under heavy braking, creating vapor pockets in the lines. Since vapor is compressible, it leads to a spongy pedal feel.
    • Moisture also promotes rust in brake lines, calipers, and the master cylinder, potentially leading to leaks or component failure.

  2. Brake Fluid Flush Procedure:

    • Tools Needed: Jack stands, wheel chocks, wrench for bleeder valves, clear hose, collection bottle, turkey baster (optional), new brake fluid. A second person is highly recommended for traditional bleeding.
    • Fluid Type: Your Traverse likely uses DOT 3 brake fluid. Always confirm with your owner's manual or the cap on the master cylinder reservoir. Do NOT mix DOT 3 and DOT 4 with DOT 5 (silicone-based).
    • Process:
      1. Safely lift the vehicle and remove the wheels.
      2. Use a turkey baster to remove old fluid from the master cylinder reservoir. Fill with new fluid.
      3. Starting with the wheel furthest from the master cylinder (typically rear passenger), attach the clear hose to the bleeder valve and place the other end in the collection bottle.
      4. Have a helper slowly press the brake pedal down and hold. Open the bleeder valve to allow old fluid/air to escape. Close the valve before the pedal is released. Repeat until clean, clear fluid comes out.
      5. Crucially: Keep the master cylinder reservoir topped up with new fluid throughout the process to prevent air from entering the system.
      6. Repeat for each wheel, working towards the master cylinder (e.g., rear passenger, rear driver, front passenger, front driver).

  3. Causes of Spongy Pedal:

    • Contaminated/Old Brake Fluid: Most common cause.
    • Air in the Brake Lines: Can happen after brake work or if the fluid reservoir runs dry.
    • Failing Master Cylinder: Less common without other symptoms, but an internal leak can cause a spongy pedal.
    • Brake Line Leak: A visible leak would typically cause a rapidly dropping pedal and fluid loss.

When to See a Shop:

  • If you're uncomfortable performing the flush yourself, as improper bleeding can leave air in the system, making the brakes unsafe.
  • If the spongy pedal persists after a thorough flush, which could indicate a master cylinder issue or other hydraulic problem.
  • If you notice any fluid leaks from calipers, lines, or the master cylinder, which require immediate professional attention.
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