how to fix my Tesla Model S Original (2012-2020) brake pedal that goes to the floor?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

581 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 a brake pedal going to the floor in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always allow the brake system to cool before working on it.
•Disconnect the battery before starting any electrical work.

Symptoms

•Brake pedal feels spongy or goes all the way to the floor.
•Warning light on the dashboard related to the brake system illuminated.
•Reduced braking power or responsiveness when attempting to stop.
•Fluid leakage visible under the vehicle near the wheels or brake components.
•Unusual noises when pressing the brake pedal (e.g., hissing or grinding).

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, calipers, and connections.
3
Scan for error codes using an OBD-II scanner to identify any brake-related faults.
4
Examine the condition of brake pads and rotors for excessive wear.
5
Test brake assist functionality to ensure it is operational.
6
Inspect the brake booster for any signs of failure or air leaks.

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 bleeder kit
•Socket set
•Torque wrench
•Pipe cutter and flaring tool

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake lines (if needed)
•Brake pads
•Brake rotors (if needed)
•Caliper seals or complete caliper (if needed)

Related Faults

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Symptoms

•Brake pedal feels spongy or goes all the way to the floor.

•Warning light on the dashboard related to the brake system illuminated.

•Reduced braking power or responsiveness when attempting to stop.

•Fluid leakage visible under the vehicle near the wheels or brake components.

•Unusual noises when pressing the brake pedal (e.g., hissing or grinding).

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in brake lines, calipers, and connections.
3
Scan for error codes using an OBD-II scanner to identify any brake-related faults.
4
Examine the condition of brake pads and rotors for excessive wear.
5
Test brake assist functionality to ensure it is operational.
6
Inspect the brake booster for any signs of failure or air leaks.

Solution

1. Preparation

Gather tools and parts needed for the repair.
Ensure the vehicle is parked on a flat surface and engage the parking brake.
Disconnect the battery to prevent electrical issues during the repair.

2. Address Fluid Leaks

Step 1: Identify the source of the leak (brake lines, calipers).
Step 2: If a brake line is damaged, replace the affected section using a pipe cutter and flaring tool.
Step 3: For caliper leaks, remove the caliper and replace the seals or the entire caliper if necessary.
Step 4: Reconnect any disconnected lines and ensure all connections are tight and secure.

3. Bleed the Brake System

Step 1: Refill the master cylinder with appropriate brake fluid (DOT 3 or DOT 4).
Step 2: Start from the wheel furthest from the master cylinder, typically the passenger rear.
Step 3: Use a brake bleeder kit or assistant to pump the brake pedal while you open and close the bleeder valve to remove air bubbles.
Step 4: Repeat for each wheel in the following order: passenger rear, driver rear, passenger front, driver front.

4. Replace Worn Components

Step 1: Inspect and replace brake pads if they are below the minimum thickness.
Step 2: Check the rotors for warping or excessive wear and replace if necessary.
Step 3: Torque all bolts to the manufacturer's specifications (typically 70-90 ft-lbs for caliper bolts).