why is my Tesla Model S Original (2012-2020) brake pedal going to the floor

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

571 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, diagnostics, and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Ensure the vehicle is on a flat surface and the parking brake is engaged before starting work.
•Disconnect the battery before working on the braking system to avoid electrical issues.
•Allow the vehicle to cool down before inspecting brake components if recently driven.

Symptoms

•Brake pedal feels soft or spongy
•Vehicle takes longer to stop
•Warning lights illuminated on the dashboard (e.g., brake warning light)
•Brake fluid leak visible under the vehicle
•Increased stopping distance

Diagnostic Steps

1
Inspect brake fluid level by checking the brake fluid reservoir for low fluid levels.
2
Perform a visual inspection for leaks around brake lines, calipers, and master cylinder.
3
Check brake pads and rotors for excessive wear or damage.
4
Scan for error codes using an OBD-II scanner to check for any related diagnostic trouble codes (DTCs).
5
Perform a pressure test on the braking system to check for drops in pressure.
6
Inspect brake lines for any signs of corrosion or damage.

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 fluid
•Wrench set
•OBD-II scanner
•Brake line bleeder kit
•Safety gloves
•Torque wrench

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Replacement brake pads and rotors (if needed)
•Brake lines or calipers (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level by checking the brake fluid reservoir for low fluid levels.
2
Perform a visual inspection for leaks around brake lines, calipers, and master cylinder.
3
Check brake pads and rotors for excessive wear or damage.
4
Scan for error codes using an OBD-II scanner to check for any related diagnostic trouble codes (DTCs).
5
Perform a pressure test on the braking system to check for drops in pressure.
6
Inspect brake lines for any signs of corrosion or damage.

Solution

1. Preparation

Tools Required: Brake fluid, wrench set, OBD-II scanner, brake line bleeder kit, and safety gloves.
Safety Warnings: Ensure the vehicle is on a flat surface and the parking brake is engaged before starting work.

2. Brake Fluid Inspection and Replacement

Open the hood and locate the brake fluid reservoir.
Check the fluid level; if below the minimum line, top it off with the recommended brake fluid (DOT 3 or DOT 4).
Inspect for any signs of contamination in the fluid (dark color, particles).
If fluid is contaminated, proceed to replace it.

3. Bleed the Brake System

Attach the brake line bleeder kit to the brake bleeder valve on each brake caliper.
Starting from the brake furthest from the master cylinder (usually the right rear):
- Open the bleeder valve and have an assistant press the brake pedal down.
- Close the valve before they release the pedal.
- Repeat until no air bubbles are present in the fluid.
Move to the next brake in the order (left rear, right front, left front) and repeat the bleeding process.
Ensure the brake fluid reservoir is kept topped up throughout the process.

4. Inspect and Replace Components as Necessary

If leaks were found during diagnostics, replace any damaged brake lines, calipers, or seals.
Replace worn brake pads and rotors if necessary, following the manufacturer’s specifications for torque values.