Tesla Model S Original (2012-2020) brake pedal goes to floor can it be fixed

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

563 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 a Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostics, and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the brake system to cool before handling components.

Symptoms

•Brake pedal feels spongy or goes to the floor with little resistance
•Warning lights illuminated on the dashboard, possibly including brake system warning
•Reduced braking effectiveness or complete brake failure
•Unusual noises when pressing the brake pedal (e.g., hissing or grinding)
•Fluid leakage under the vehicle, particularly near the wheels or brake lines

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in the brake lines, hoses, and around calipers.
3
Scan the vehicle for diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Test the brake booster for proper function (if applicable).
5
Examine brake pads and rotors for wear and damage.
6
Verify the condition of the brake master cylinder by checking for internal 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
•Wrench set
•Brake line wrench
•Socket set
•Torque wrench
•Brake bleeder kit

Parts Required

•Brake master cylinder (if necessary)
•Brake lines or hoses (if damaged)

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Symptoms

•Brake pedal feels spongy or goes to the floor with little resistance

•Warning lights illuminated on the dashboard, possibly including brake system warning

•Reduced braking effectiveness or complete brake failure

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

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

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in the brake lines, hoses, and around calipers.
3
Scan the vehicle for diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Test the brake booster for proper function (if applicable).
5
Examine brake pads and rotors for wear and damage.
6
Verify the condition of the brake master cylinder by checking for internal leaks.

Solution

1. Preparation

Gather tools and parts required for the repair.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Brake Fluid Leaks

Tools Required: Wrench set, brake line wrench, fluid catch pan.
Sub-steps:
1. Inspect brake lines for cracks or corrosion. Replace any damaged sections.
2. Tighten any loose fittings on the brake lines and calipers.
3. If a leak is found, replace the affected brake line or hose with a new one.

3. Replace Brake Master Cylinder (if necessary)

Tools Required: Socket set, brake line wrench, torque wrench.
Sub-steps:
1. Remove the brake fluid reservoir cap and siphon out fluid as needed.
2. Disconnect brake lines from the master cylinder, using a brake line wrench to prevent damage.
3. Unfasten the master cylinder from the brake booster or firewall.
4. Install the new master cylinder and secure it with the appropriate torque settings (typically 15-20 ft-lbs).
5. Reconnect brake lines and ensure they are properly tightened.

4. Bleed the Brake System

Tools Required: Brake bleeder kit or two-person method, brake fluid (DOT 3 or 4, as specified).
Sub-steps:
1. Begin at the wheel furthest from the master cylinder and work towards the closest.
2. Attach the bleeder kit to the brake caliper and open the bleeder valve.
3. Pump the brake pedal until fluid with no bubbles flows into the kit, then close the valve.
4. Repeat for each wheel, ensuring to top off the master cylinder as needed during the process.