how can I tell if my Ford Explorer Fifth Generation (2011-2019) master cylinder is bad

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

632 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 master cylinder issues 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

•Disconnect the battery before working on electrical systems.
•Brake fluid is corrosive; clean any spills immediately and avoid contact with painted surfaces.

Symptoms

•Brake pedal feels spongy or soft when pressed
•Brake warning light illuminated on the dashboard
•Fluid leaks around the master cylinder
•Decreased braking performance or longer stopping distances
•Unusual noises (such as hissing or grinding) when braking
•Brake fluid level dropping without visible leaks

Diagnostic Steps

1
Inspect the brake fluid level in the reservoir and check for discoloration or contamination.
2
Visually inspect the master cylinder for any signs of leaking fluid or corrosion.
3
Examine brake lines and connections for any signs of damage or leaks.
4
Press the brake pedal and observe its feel; a spongy pedal indicates potential air in the system or master cylinder failure.
5
Perform a brake fluid pressure test with a gauge to check for consistent pressure.
6
Check for any error codes using an OBD-II scanner that may indicate issues with 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

•Socket set
•Flare nut wrench
•Brake bleeder kit
•Torque wrench
•Safety glasses
•Gloves

Parts Required

•New master cylinder
•Brake fluid (DOT 3 or DOT 4)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Brake pedal feels spongy or soft when pressed

•Brake warning light illuminated on the dashboard

•Fluid leaks around the master cylinder

•Decreased braking performance or longer stopping distances

•Unusual noises (such as hissing or grinding) when braking

•Brake fluid level dropping without visible leaks

Diagnostic Steps

1
Inspect the brake fluid level in the reservoir and check for discoloration or contamination.
2
Visually inspect the master cylinder for any signs of leaking fluid or corrosion.
3
Examine brake lines and connections for any signs of damage or leaks.
4
Press the brake pedal and observe its feel; a spongy pedal indicates potential air in the system or master cylinder failure.
5
Perform a brake fluid pressure test with a gauge to check for consistent pressure.
6
Check for any error codes using an OBD-II scanner that may indicate issues with the braking system.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a level surface and set the parking brake.
Wear safety glasses and gloves for protection.

2. Remove the Master Cylinder

Disconnect the negative battery terminal to prevent electrical issues.
Remove any components blocking access to the master cylinder (like the air intake duct if necessary).
Disconnect brake lines from the master cylinder using a flare nut wrench. Be careful to catch any leaking brake fluid.
Unbolt the master cylinder from the brake booster (usually two to four bolts) using a socket set.
Carefully lift the master cylinder away from the brake booster.

3. Inspect and Replace

Inspect the old master cylinder for internal damage or corrosion.
If necessary, replace the master cylinder with a new unit that meets OEM specifications.
Install the new master cylinder by aligning it with the brake booster and securing it with bolts to the specified torque (usually around 15-20 ft-lbs).
Reconnect the brake lines carefully, ensuring they are tight but not over-tightened.

4. Bleed the Brake System

Refill the brake fluid reservoir with the appropriate DOT fluid (usually DOT 3 or DOT 4, as specified in the owner’s manual).
Begin bleeding the brake system starting from the farthest wheel from the master cylinder (usually the rear passenger side) to the closest (driver's side front).
Use a brake bleeder kit or have an assistant pump the brake pedal while you open and close the bleeder valves.
Repeat until all air bubbles are removed from the system.

5. Final Checks

Reconnect the negative battery terminal.
Check the brake fluid level and ensure it is at the correct level.
Start the vehicle and press the brake pedal to ensure firmness.