why does my Ford F-150 13th Generation (2015-2020) lose brake pressure

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

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

677 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 brake pressure loss in Ford F-150 (2015-2020). 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

•Use caution when working with hydraulic systems, as brake fluid can damage vehicle paint.
•Disconnect the negative battery terminal to prevent electrical shorts.

Symptoms

•Brake pedal feels soft or spongy
•Decreased braking performance
•Warning light illuminated on the dashboard
•Brake fluid leaking under the vehicle
•Increased stopping distance
•Unusual noises when braking

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in the brake lines, hoses, and calipers.
3
Use a brake fluid tester to assess fluid condition and moisture content.
4
Inspect brake pads and rotors for wear or damage.
5
Examine the brake booster for proper operation and any signs of failure.
6
Scan the vehicle's computer for any fault codes related to the braking system.

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
•Cutting tool
•Flare tool
•Brake bleeder kit
•Socket set
•Torque wrench

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake pads
•Brake rotors
•Brake lines or hoses

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in the brake lines, hoses, and calipers.
3
Use a brake fluid tester to assess fluid condition and moisture content.
4
Inspect brake pads and rotors for wear or damage.
5
Examine the brake booster for proper operation and any signs of failure.
6
Scan the vehicle's computer for any fault codes related to the braking system.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and engage the parking brake.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Brake Lines or Hoses

Inspect: Visually examine all brake lines and hoses for cracks, leaks, or wear.
Replace: If any damage is found, replace the affected brake lines or hoses.
- Tools Required: Brake line wrench, cutting tool, flare tool, and brake line fittings.
- Safety Warning: Use caution when working with hydraulic systems, as brake fluid can damage vehicle paint.

3. Check and Refill Brake Fluid

Check: Inspect the brake fluid level in the master cylinder. If low, refill with the correct type of brake fluid (DOT 3 or DOT 4 depending on specifications).
Bleed Brakes: After refilling, bleed the braking system to remove air bubbles.
- Tools Required: Brake bleeder kit.
- Sub-steps:
  1. Starting with the wheel farthest from the master cylinder, have an assistant pump the brake pedal several times and hold it down.
  2. Open the bleeder valve on the brake caliper to allow brake fluid and air to escape until a steady stream appears.
  3. Close the bleeder valve and have the assistant release the brake pedal.
  4. Repeat for each wheel in the correct order (typically rear passenger, rear driver, front passenger, front driver).

4. Inspect and Replace Brake Components

Inspect: Examine brake pads, rotors, and calipers for wear and damage.
Replace: If any components are worn beyond specifications, replace them.
- Tools Required: Socket set, torque wrench, brake cleaner.
- Sub-steps:
  1. Remove the wheel and tire assembly.
  2. Remove the caliper and bracket.
  3. Replace the brake pads and inspect the rotor surface for scoring or uneven wear.
  4. Reinstall the caliper and torque bolts to manufacturer specifications.

5. Test the Brake Booster

Test: Check the brake booster for correct operation.
- Sub-steps:
  1. With the engine off, pump the brake pedal until it becomes hard.
  2. Start the engine. If the pedal drops slightly, the booster is functioning correctly. If not, replace the brake booster.
- Tools Required: None specifically, but may require a vacuum gauge for detailed testing.