how to fix Ford Explorer Fifth Generation (2011-2019) brake pedal sinking 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 sinking brake pedal in 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 glasses when working with brake fluid, as it can damage paint and surfaces.
•Ensure the vehicle is secure on jack stands before working underneath.

Symptoms

•Brake pedal feels soft or spongy
•Brake warning light illuminated
•Reduced braking efficiency
•Fluid leaking from brake components
•Unusual noises when brakes are applied

Diagnostic Steps

1
Inspect the brake fluid level in the master cylinder reservoir.
2
Check for fluid leaks around brake lines, calipers, and the master cylinder.
3
Scan for diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Inspect the brake booster for proper operation and vacuum integrity.
5
Test the brake master cylinder for internal leaks by performing a bench test or pressure test.
6
Verify the condition of the brake lines for corrosion or damage.

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
•Line wrenches
•Torque wrench
•Turkey baster
•Socket set

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•New brake lines (if damaged)
•New master cylinder (if faulty)

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Diagnostic Steps

1
Inspect the brake fluid level in the master cylinder reservoir.
2
Check for fluid leaks around brake lines, calipers, and the master cylinder.
3
Scan for diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Inspect the brake booster for proper operation and vacuum integrity.
5
Test the brake master cylinder for internal leaks by performing a bench test or pressure test.
6
Verify the condition of the brake lines for corrosion or damage.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is on a flat surface and securely lifted with jack stands.
Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Brake Fluid

Remove the master cylinder reservoir cap.
Use a turkey baster to siphon out old brake fluid.
Refill with new brake fluid according to Ford specifications (DOT 3 or DOT 4).

3. Repair/Replace Brake Components

A. Replace Brake Lines (if damaged)

Locate the damaged brake line.
Use a line wrench to disconnect the brake line from the fitting.
Measure and cut a new brake line to the appropriate length.
Flare the ends of the new brake line and install it.
Tighten the fittings securely.

B. Replace Master Cylinder (if faulty)

Remove the brake lines from the master cylinder using a line wrench.
Unbolt the master cylinder from the brake booster.
Install the new master cylinder by reversing the removal steps.
Reattach the brake lines and torque to manufacturer's specifications.

4. Bleed the Brake System

Fill the master cylinder with new brake fluid.
Begin bleeding the brakes at the furthest wheel from the master cylinder (right rear).
Use a brake bleeder kit or have an assistant pump the brake pedal while you open and close the bleeder valve.
Repeat for each wheel in the order: right rear, left rear, right front, left front.
Ensure no air bubbles are present in the fluid.

5. Final Checks

Reinstall the master cylinder cap.
Reconnect the battery terminal.
Test the brake pedal for firmness.