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

4 min read

611 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 disconnect the battery before working on electrical components.
•Allow the brake system to cool before bleeding or inspecting to avoid burns.

Symptoms

•Spongy brake pedal feel
•Brake pedal travels to the floor
•Reduced braking effectiveness
•Possible brake warning light illuminated on the dashboard
•Fluid leakage under the vehicle near the wheels or master cylinder

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, hoses, and around the master cylinder.
3
Examine brake components, including calipers and wheel cylinders for wear or damage.
4
Scan for brake-related error codes using an OBD-II scanner.
5
Perform a brake bleed 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
•Brake bleeder kit
•Flare nut wrench
•Socket set
•Torque wrench

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake lines or hoses (if damaged)
•Master cylinder (if needed)

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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 master cylinder.
3
Examine brake components, including calipers and wheel cylinders for wear or damage.
4
Scan for brake-related error codes using an OBD-II scanner.
5
Perform a brake bleed to check for air in the brake lines.

Solution

1. Preparation

Gather required tools and parts for the repair.
Ensure the vehicle is parked on a level surface and the parking brake is engaged.
Wear safety goggles and gloves for protection.

2. Inspect and Address Fluid Leaks

Inspect Brake Lines and Hoses:
- Use a flashlight to visually check all brake lines and hoses for cracks, corrosion, or fluid leakage.
Repair or Replace Damaged Components:
- If any damaged lines or hoses are found, replace them using the appropriate parts.
- Use a flare nut wrench to avoid rounding the nuts. Torque new connections to manufacturer specifications.

3. Bleed the Brake System

Prepare Tools:
- Use a brake bleeder kit, clear tubing, and a container.
Bleeding Procedure:
- Start with the brake furthest from the master cylinder (usually the right rear).
- Have an assistant pump the brake pedal several times and hold it down.
- Open the bleeder valve on the brake caliper to release air and old fluid, then close it before the pedal is released.
- Repeat until no air bubbles appear in the fluid.
- Continue bleeding the left rear, right front, and then left front brakes in the same manner.
Check Fluid Levels:
- Ensure the master cylinder reservoir is kept topped up with the correct brake fluid type (DOT 3 or DOT 4).

4. Replace the Master Cylinder (if necessary)

Remove the Old Master Cylinder:
- Disconnect the brake lines from the master cylinder using a flare nut wrench.
- Unbolt the master cylinder from the brake booster and carefully remove it.
Install New Master Cylinder:
- Position the new master cylinder onto the brake booster and secure it with bolts to the specified torque.
- Reconnect brake lines and ensure they are tight and leak-free.