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2021 Ford Expedition Limited - Brake Fluid Flush Interval & Spongy Pedal

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David L. · rep 0 · May 22, 2:28 AM · 1 replies · solved · Question

Vehicle: 2021 Ford Expedition Limited

Hello Ford community,

I've got a 2021 Ford Expedition Limited with about 40,000 miles on it. Lately, I've noticed the brake pedal feels a bit 'spongy' or less firm than it used to be. The braking performance seems okay, but the feel isn't as confident.

I'm wondering if it's time for a brake fluid flush. What's the recommended interval for brake fluid changes on these heavier SUVs? Also, what type of brake fluid does the Expedition use? I want to make sure I'm using the correct DOT rating.

Could this spongy pedal be a sign of air in the lines, or just old fluid? Any advice on this would be great!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 2:28 AM

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ClearTheCode admin answer:

Your observation of a 'spongy' brake pedal on your 2021 Ford Expedition Limited, especially at 40,000 miles, is a good indicator that a brake fluid flush is likely due. Brake fluid is hygroscopic, meaning it absorbs moisture over time, which degrades its performance.

Recommended Interval:

  • Ford generally recommends a brake fluid flush every 2 years or 30,000 miles, whichever comes first, for optimal performance and longevity of your braking system. Given your mileage and the age of the vehicle, you're right on schedule for this maintenance.

Brake Fluid Type:

  • Your 2021 Ford Expedition requires DOT 4 Low Viscosity (LV) brake fluid. It's crucial to use this specific type. Using standard DOT 3 or DOT 4 fluid can negatively impact the performance of your ABS and stability control systems, especially in cold weather, due to its higher viscosity. Always check your owner's manual or the cap on your brake fluid reservoir for the exact specification.

Causes of Spongy Pedal:

  1. Moisture Contamination: As brake fluid absorbs water, its boiling point decreases. When brakes get hot, this water can boil and create compressible vapor bubbles in the lines, leading to a spongy pedal.
  2. Air in the Lines: This is a common cause of sponginess. It can happen after brake component replacement or if the fluid level drops too low.
  3. Worn Components: While less likely to cause a spongy pedal directly, worn calipers, master cylinder, or brake lines can contribute to a less firm feel.
  4. ABS Module Issues: Rarely, an issue with the ABS module can affect pedal feel, but this usually triggers a warning light and specific diagnostic trouble codes.

When to See a Shop:

  • If the spongy pedal is accompanied by a warning light (e.g., ABS light, brake system warning), or if braking performance significantly degrades, get it to a shop immediately.
  • A professional can perform a thorough brake system inspection, including checking for leaks, bleeding the system properly, and ensuring the correct fluid is used. Brake fluid flushes can be tricky to do correctly at home, especially on modern vehicles with ABS, as air can get trapped in the ABS module, requiring specialized scan tools to cycle the pump for proper bleeding.
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