how to fix Ford F-150 13th Generation (2015-2020) brake pedal going to the floor

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

635 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 the brake pedal going to the floor in a 2015-2020 Ford F-150. 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 the brake system.
•Ensure the vehicle is securely supported on jack stands when working underneath.

Symptoms

•Brake pedal sinks to the floor with little resistance
•Warning light illuminated on the dashboard (brake warning light)
•Low brake fluid level in the master cylinder reservoir
•Soft or spongy brake feel when pressed
•Unusual noises (such as hissing) when the brake pedal is applied

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir; top off if low.
2
Check for visible brake fluid leaks around brake lines, calipers, and the master cylinder.
3
Inspect the brake lines and connections for any signs of damage or corrosion.
4
Perform a brake system pressure test to check for leaks in the system.
5
If no leaks are found, check the condition of the master cylinder by performing a bench test or road test.
6
Inspect brake calipers and wheel cylinders for proper operation.

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

•Brake line wrench
•Socket set
•Torque wrench
•Brake fluid (DOT 3 or DOT 4)
•Brake bleeder kit
•Multimeter (if checking electrical components)

Parts Required

•Brake fluid (if low)
•Brake lines (if damaged)
•Master cylinder (if faulty)

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Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir; top off if low.
2
Check for visible brake fluid leaks around brake lines, calipers, and the master cylinder.
3
Inspect the brake lines and connections for any signs of damage or corrosion.
4
Perform a brake system pressure test to check for leaks in the system.
5
If no leaks are found, check the condition of the master cylinder by performing a bench test or road test.
6
Inspect brake calipers and wheel cylinders for proper operation.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Wear safety glasses and gloves.

Tools Required:

Brake line wrench
Socket set
Torque wrench
Brake fluid (DOT 3 or DOT 4)
Brake bleeder kit
Multimeter (if checking electrical components)

2. Inspect and Replace Damaged Components

Check for Leaks:
- Visually inspect brake lines, fittings, calipers, and the master cylinder for leaks.
- Replace any damaged brake lines or components found during inspection.
Replace Master Cylinder (if necessary):
- Disconnect the negative battery terminal.
- Remove the brake lines from the master cylinder using a brake line wrench.
- Unbolt the master cylinder from the brake booster (usually 2-4 bolts).
- Install the new master cylinder by reversing the removal steps.
- Torque the bolts to the manufacturer's specifications (typically 15-20 ft-lbs).

3. Bleed the Brake System

Prepare Brake Bleeding:
- Fill the master cylinder reservoir with fresh brake fluid.
- Attach the brake bleeder kit to the bleeder valve on the furthest wheel from the master cylinder (usually the right rear).
Bleed Each Brake:
- Have an assistant pump the brake pedal several times, then hold it down.
- Open the bleeder valve to allow air and fluid to escape, then close it before your assistant releases the pedal.
- Repeat this process until no air bubbles are present in the fluid at that wheel.
- Move to the next wheel in order (left rear, right front, left front).

4. Final Checks

Recheck the brake fluid level in the master cylinder and top off if necessary.
Reconnect the negative battery terminal.
Test the brake pedal feel before driving.