how to fix brake pedal going to the floor in Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

590 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 Tesla Model S (2012-2020). 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

•Disconnect the 12V battery before working on the braking system to prevent unintended activation.
•Allow the vehicle to sit for a few minutes if the brakes have been used heavily to avoid burns from hot components.

Symptoms

•Brake pedal feels soft or spongy
•Brake warning light illuminated on the dashboard
•Reduced braking effectiveness
•Brake fluid leakage underneath the vehicle
•Unusual noise when pressing the brake pedal

Diagnostic Steps

1
Inspect brake fluid reservoir for low fluid levels.
2
Check for visible leaks in brake lines, calipers, and master cylinder.
3
Use an OBD-II scanner to check for any fault codes related to the braking system.
4
Perform a visual inspection of the brake pads and rotors for wear or damage.
5
Test the brake pedal feel with the vehicle stationary to assess for air in the brake lines.

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

•OBD-II scanner
•Brake fluid bleeder kit
•Wrench set
•Socket set
•Torque wrench
•Brake cleaner
•Clean rags

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake lines (if damaged)
•Brake calipers (if leaking or damaged)
•Master cylinder (if faulty)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid reservoir for low fluid levels.
2
Check for visible leaks in brake lines, calipers, and master cylinder.
3
Use an OBD-II scanner to check for any fault codes related to the braking system.
4
Perform a visual inspection of the brake pads and rotors for wear or damage.
5
Test the brake pedal feel with the vehicle stationary to assess for air in the brake lines.

Solution

1. Preparation

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

2. Inspect and Replace Brake Fluid

Tools Required: Brake fluid bleeder kit, wrench, clean rags
Check the brake fluid reservoir; if low, top off with the recommended brake fluid (DOT 3 or DOT 4).
If fluid is contaminated, drain the old fluid using the bleeder kit.
Replace with new brake fluid, ensuring the reservoir does not run dry during the process.

3. Bleed the Brake System

Tools Required: Brake fluid bleeder kit, wrench
Starting from the wheel furthest from the master cylinder (right rear), attach the bleeder kit to the brake caliper.
Have an assistant pump the brake pedal several times and hold it down.
Open the bleeder valve to release air and old fluid, then close it before the pedal is released.
Repeat this process for each wheel in the order: right rear, left rear, right front, left front.
Check the brake fluid level after bleeding and top off if necessary.

4. Inspect and Replace Brake Components (if necessary)

Tools Required: Socket set, torque wrench, brake cleaner
Inspect brake lines, calipers, and the master cylinder for any damage or leaks.
Replace any damaged components with OEM parts.
Ensure all connections are tight and secure, and torque to manufacturer specifications.

5. Final Checks

After repairs, check the brake fluid level one last time.
Test the brake pedal by pressing it down several times to ensure a firm feel is restored.