why does my Ford Explorer Fifth Generation (2011-2019) brake pedal feel spongy and goes to the floor

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

594 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix a spongy brake pedal in a Ford Explorer (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always wear safety goggles and gloves when working on the brake system.
•Ensure the vehicle is secure and on a flat surface before starting repairs.

Symptoms

•Spongy brake pedal feel
•Brake pedal travels to the floor
•Reduced braking effectiveness
•Potential brake warning light illuminated
•Increased stopping distance

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, hoses, and around the calipers.
3
Examine the condition of brake pads and rotors for wear or damage.
4
Test the brake booster for proper operation by applying brake pedal pressure with the engine off, then starting the engine to see if the pedal drops slightly.
5
Scan for any fault codes using an OBD-II scanner.
6
Bleed the brake system to check for air in the brake lines.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Wrench set
•Brake fluid
•Bleeding kit (hose and container)

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake pads (if worn)
•Brake rotors (if damaged)
•Brake calipers (if leaking)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, hoses, and around the calipers.
3
Examine the condition of brake pads and rotors for wear or damage.
4
Test the brake booster for proper operation by applying brake pedal pressure with the engine off, then starting the engine to see if the pedal drops slightly.
5
Scan for any fault codes using an OBD-II scanner.
6
Bleed the brake system to check for air in the brake lines.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Wear safety goggles and gloves.

2. Check Brake Fluid Level

Open the hood and locate the master cylinder.
Remove the cap and visually inspect the brake fluid level.
If low, top off with the manufacturer-recommended brake fluid (DOT 3 or DOT 4).

3. Inspect Brake System

Brake Lines and Hoses:
- Use a wrench to check connections for loose fittings.
- Look for any signs of corrosion or damage.
Brake Calipers:
- Inspect calipers for any brake fluid leaks. If leaking, replace calipers.
Brake Pads and Rotors:
- Remove the wheel using a socket set.
- Inspect brake pads for thickness (replace if below 3mm) and rotors for scoring or warping.

4. Bleed the Brake System

Locate the brake bleeder valves on each caliper.
Attach a clear hose to the bleeder valve and submerge the other end in a container filled with brake fluid.
Open the bleeder valve (turn counterclockwise) and have an assistant press the brake pedal several times.
Close the valve before the pedal reaches the floor. Repeat until no air bubbles are present.
Ensure to bleed each caliper in the correct order (typically: LR, RR, RF, LF).

5. Test Brake Booster

With the engine off, press the brake pedal several times to deplete the booster.
Start the engine; the brake pedal should drop slightly under foot pressure indicating a functioning booster.

6. Final Assembly

Reinstall the wheel and torque the lug nuts to the manufacturer's specification (usually around 100-120 ft-lbs).
Recheck brake fluid level and top off if necessary.