what causes brake pedal to go to the floor in Honda Accord 9th Generation (2013-2017)?

Honda Accord Eleventh Generation (2023-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

680 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 Honda Accord 2013-2017. 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 work on brakes with the vehicle securely lifted and supported.

Symptoms

•Brake pedal sinks to the floor with little to no resistance
•Warning lights on the dashboard illuminated, such as the brake warning light
•Reduced braking effectiveness or a spongy brake feel
•Fluid leaks under the vehicle, particularly near the wheels or brake lines
•Unusual noises when applying the brakes, such as grinding or hissing

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, hoses, and at the calipers and wheel cylinders.
3
Examine the condition of the brake pads and rotors for wear or damage.
4
Use a brake bleeder kit to check for air in the brake lines.
5
Inspect the master cylinder for signs of failure or internal leaks.
6
Test the brake booster for vacuum leaks or failure.

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 bleeder kit
•Socket set
•Torque wrench
•Turkey baster

Parts Required

•Brake fluid (DOT 3 or 4)
•Brake lines (if damaged)
•Brake pads and rotors (if worn)
•Master cylinder (if defective)

Related Faults

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Symptoms

•Brake pedal sinks to the floor with little to no resistance

•Warning lights on the dashboard illuminated, such as the brake warning light

•Reduced braking effectiveness or a spongy brake feel

•Fluid leaks under the vehicle, particularly near the wheels or brake lines

•Unusual noises when applying the brakes, such as grinding or hissing

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, hoses, and at the calipers and wheel cylinders.
3
Examine the condition of the brake pads and rotors for wear or damage.
4
Use a brake bleeder kit to check for air in the brake lines.
5
Inspect the master cylinder for signs of failure or internal leaks.
6
Test the brake booster for vacuum leaks or failure.

Solution

1. Preparation

Gather tools and materials: brake fluid, brake bleeder kit, socket set, and a torque wrench.
Ensure the vehicle is on a level surface and secure it with wheel chocks.
Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Brake Fluid

Sub-steps:
- Open the master cylinder reservoir cap and inspect the fluid condition.
- If the fluid is contaminated or low, remove the old fluid using a turkey baster.
- Fill the reservoir with fresh brake fluid that meets Honda specifications (DOT 3 or 4).
- Re-cap the reservoir securely.

3. Identify and Repair Leaks

Sub-steps:
- Visually inspect all brake lines and connections for signs of fluid leakage.
- If leaks are found, replace damaged brake lines or fittings.
- Tighten any loose connections as necessary.
- Replace any leaking calipers or wheel cylinders.

4. Bleed the Brake System

Sub-steps:
- Connect a brake bleeder kit to the brake bleeder valves on the calipers.
- Starting from the furthest wheel (right rear), open the bleeder valve and pump the brake pedal until fluid flows without air bubbles.
- Close the valve and repeat for the left rear, right front, and left front calipers.
- Check fluid levels in the master cylinder reservoir throughout the bleeding process.

5. Inspect and Replace the Master Cylinder (if necessary)

Sub-steps:
- Remove the master cylinder by disconnecting the brake lines and unbolting it from the brake booster.
- Inspect for internal leaks by checking for any fluid in the booster.
- If defective, replace the master cylinder with a new unit.
- Reinstall the master cylinder and reconnect the brake lines, ensuring all connections are secure.

6. Reassemble and Test

Sub-steps:
- Reconnect the negative battery terminal.
- Test the brake pedal for firmness before starting the vehicle.
- Conduct a short test drive to ensure brakes are functioning properly.