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Soft/Spongy Brake Pedal on 2020 Ford Explorer

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Mike T. · rep 0 · May 25, 1:33 AM · 1 replies · solved · Question

Vehicle: 2020 Ford Explorer Limited

Hi all,

I've got a 2020 Ford Explorer Limited with about 45,000 miles. Lately, the brake pedal has started feeling really soft and spongy. It doesn't seem to have the firm feel it used to, and I have to push it down further to get the same braking power. There are no warning lights on the dash, like the ABS or brake light.

I haven't noticed any leaks under the car, and the brake fluid reservoir looks full. The braking performance itself seems okay once the pedal is pushed down, but it's just not inspiring confidence. Could this be air in the lines, or something more serious like the master cylinder? Any ideas on what to check or what might be causing this?

Thanks for your help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:33 AM

0

ClearTheCode admin answer:

A soft or spongy brake pedal on your 2020 Ford Explorer Limited, without warning lights, typically points to an issue within the hydraulic braking system. Here's a breakdown of the most likely causes and diagnostic steps:

Common Causes:

  1. Air in the Brake Lines: This is the most common cause. Air is compressible, unlike brake fluid, leading to a spongy pedal feel as the air compresses before the fluid pressure builds up.
  2. Contaminated or Old Brake Fluid: Over time, brake fluid can absorb moisture, reducing its boiling point and effectiveness, especially under heavy braking. Contaminants can also affect seals.
  3. Worn Master Cylinder: The master cylinder is responsible for converting pedal force into hydraulic pressure. Internal seals can wear out, allowing fluid to bypass and reducing pressure, leading to a soft pedal. This often manifests as the pedal slowly sinking while pressure is applied.
  4. Leaking Caliper or Wheel Cylinder: While you haven't seen leaks, a small internal leak in a caliper or wheel cylinder could be present, reducing overall system pressure.
  5. Faulty Brake Hoses: Hoses can swell under pressure if they are old or degraded, absorbing some of the hydraulic force rather than transmitting it directly to the calipers.

Diagnostics & What to Check:

  1. Check Brake Fluid Condition: Open the reservoir and inspect the fluid. It should be clear or light amber. Dark, murky fluid indicates it's old and needs flushing.
  2. Bleed the Brake System: If air is suspected, a proper brake bleed, starting from the wheel furthest from the master cylinder, can remove air bubbles.
  3. Inspect Brake Hoses: Look for any bulges or cracks in the rubber brake hoses leading to each wheel.
  4. Pump the Pedal: With the engine off, pump the brake pedal several times until it feels firm. Then, hold firm pressure on the pedal for a minute or two. If the pedal slowly sinks to the floor, it strongly suggests a failing master cylinder.

When to See a Shop:

  • If bleeding the brakes doesn't resolve the issue.
  • If the pedal continues to feel soft or sinks, indicating a potential master cylinder failure.
  • If you suspect a leak that you can't locate.
  • Brake system issues are critical for safety. If you're unsure, or the problem persists, have a qualified technician diagnose and repair it immediately.
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