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After Changing Brake Pads, Pedal Goes to the Floor – What Went Wrong?

Imagine this: you’ve just replaced your brake pads, feeling confident and ready to hit the road. But a sinking feeling washes over you as you press the brake pedal – it goes all the way to the floor. Your heart races as you realize your brakes are failing. This nightmare scenario is a common fear among DIY car enthusiasts, and it can be a frustrating and dangerous situation. This article will explore the reasons behind this dreaded situation, offering solutions and guidance to ensure your braking system remains reliable and safe.

After Changing Brake Pads, Pedal Goes to the Floor – What Went Wrong?
Image: carfromjapan.com

The brake pedal going to the floor after changing brake pads is a common issue, and it’s critical to understand why it happens to prevent accidents and ensure your safety. Understanding the underlying cause allows you to address it effectively, restoring confidence in your braking system.

Common Culprits:

1. Air in the Brake Lines:

The most common culprit behind a spongy or going-to-the-floor brake pedal is air trapped in the brake lines. Here’s why:

  • Hydraulic System: Your braking system relies on hydraulic fluid, which carries pressure from the pedal to the calipers, squeezing the brake pads against the rotors.
  • Bleeding the System: When you bleed the brakes, you remove any air bubbles from the system, ensuring the hydraulic fluid can smoothly transmit pressure.
  • Bleeding Mistakes: If you didn’t bleed the brakes correctly, air bubbles can remain, interfering with the system’s effectiveness.

2. Low Brake Fluid Level:

You may have forgotten to top off the brake fluid after changing the pads.

  • Brake Fluid Reservoir: When you depress the pedal, the master cylinder draws fluid from the reservoir to pressurize the system.
  • Insufficient Fluid: If the fluid level is low, the master cylinder runs out of fluid, causing the pedal to drop.
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3. Master Cylinder Failure:

In rare cases, the master cylinder itself could be faulty, causing the pedal to go to the floor.

  • Master Cylinder Function: The master cylinder is responsible for converting pedal pressure into hydraulic pressure.
  • Internal Leaks: If the master cylinder has internal leaks or wear, it may not be able to maintain pressure effectively, leading to pedal failure.

4. Faulty Brake Caliper:

While less frequent, a faulty brake caliper can also cause the pedal to go to the floor.

  • Caliper Function: The brake caliper holds the brake pads and applies pressure onto the rotor when you brake.
  • Internal Leaks: A worn or damaged brake caliper might have internal leaks, causing the hydraulic pressure to leak out, resulting in a spongy or low brake pedal.

5. Improper Pad Installation:

  • Pad Wear Sensors: If your brake pads have wear sensors, make sure they are properly connected. If the sensor wire isn’t properly attached, it will trigger an error in the system.
  • Caliper Piston Retraction: When installing new brake pads, be sure to properly retract the caliper piston. If the piston isn’t fully retracted, it can cause the new pads to drag, leading to increased wear and a spongy pedal.

Addressing the Problem:

1. Bleeding the Brakes:

  • Professional Assistance: If you’re unsure about bleeding brakes, seek help from a qualified mechanic. Incorrect bleeding can worsen the issue.
  • DIY Process: If you’re comfortable with the task, you can do it yourself. Refer to your vehicle’s service manual for detailed instructions specific to your model.
  • Necessary Equipment: You’ll need a brake bleeder kit (includes a bleeder bottle, tubing, and a bleeder wrench), new brake fluid, and a helper.
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2. Checking and Topping Off Brake Fluid:

  • Locate the Reservoir: Find your vehicle’s brake fluid reservoir (usually under the hood near the master cylinder).
  • Fluid Level: The reservoir should have a clear marking to indicate the proper fluid level.
  • Adding Fluid: Add brake fluid as needed, avoiding overfilling.

3. Master Cylinder Inspection:

  • Visual Inspection: Examine the master cylinder for any signs of leakage or damage. Look for cracks, fluid stains, or loose connections.
  • Possible Solutions: If you find any issues, the master cylinder must be replaced.

4. Caliper Inspection and Repair:

  • Visual Inspection: Check the brake calipers for leaks, cracks, or signs of excessive wear.
  • Caliper Repair or Replacement: If you find damage, repair or replace the caliper as necessary.

5. Checking the Pad Wear Sensors:

  • Locate the Sensor: Find the sensor wire, typically located on the inside or outside of the brake pad.
  • Secure Connection: Ensure the sensor wire is securely attached.

6. Retracting the Caliper Piston:

  • Special Tool: Use a caliper piston retraction tool to fully retract the piston.
  • Fluid Flow Prevention: Make sure you prevent brake fluid from spilling out during retraction.

Professional Assistance:

  • Experienced Mechanics: If you’re not confident in your DIY skills, seek professional help from an experienced mechanic.
  • Diagnosis and Repair: They can diagnose the underlying issue and make the necessary repairs to ensure your braking system functions correctly again.

2000 Ford Focus Brake Pedal Goes Floor | Floor Roma
Image: mromavolley.com

Preventing Future Problems:

  • Regular Maintenance: Follow your vehicle’s maintenance schedule and have your brakes inspected regularly.
  • Quality Parts: When replacing brake components, always use high-quality parts from reputable manufacturers.
  • Proper Installation: If you’re comfortable working on your car, ensure you have the proper tools and follow the instructions carefully.
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After Changing Brake Pads Pedal Goes Floor

Conclusion:

The experience of having your brake pedal go to the floor after changing brake pads can be terrifying. However, understanding the potential causes, diagnosing the issue, and addressing it correctly can restore your peace of mind and ensure the safety of yourself and others. Remember, a properly functioning braking system is crucial for a safe and enjoyable driving experience.


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