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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

630 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

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before working on components.

Symptoms

•Brake pedal feels spongy or goes to the floor when pressed
•Warning light illuminated on the dashboard
•Reduced braking effectiveness or longer stopping distance
•Brake fluid leak visible under the vehicle
•Unusual noises when pressing the brake pedal (e.g., grinding or squeaking)

Diagnostic Steps

1
Inspect brake fluid level in the reservoir.
2
Check for visible leaks in the brake lines, calipers, and master cylinder.
3
Scan for diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Visually inspect brake pads and rotors for wear and damage.
5
Test brake pedal feel and performance by applying pressure with the vehicle stationary.

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
•Wrench set
•Socket set
•Torque wrench
•Line wrenches

Parts Required

•Brake fluid
•Brake lines (if damaged)
•Master cylinder (if faulty)

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Diagnostic Steps

1
Inspect brake fluid level in the reservoir.
2
Check for visible leaks in the brake lines, calipers, and master cylinder.
3
Scan for diagnostic trouble codes (DTCs) using an OBD-II scanner.
4
Visually inspect brake pads and rotors for wear and damage.
5
Test brake pedal feel and performance by applying pressure with the vehicle stationary.

Solution

1. Preparation

Gather tools and parts required for the repair.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Replace Brake Fluid

Tools Required: Brake fluid, funnel, rags.
Check the brake fluid reservoir; if low, top it off with the manufacturer's recommended brake fluid.
Inspect for contamination in the brake fluid. If contaminated, proceed to replace it.
- Use a brake bleeder kit to remove old fluid from the system.
- Refill the reservoir with fresh brake fluid.

3. Inspect and Repair Brake Lines

Tools Required: Wrench set, line wrenches, brake line cutter.
Visually inspect brake lines for corrosion, cracks, or leaks.
If any damage is found, replace the damaged sections of the brake line.
- Use a line wrench to disconnect the damaged line.
- Cut and replace with new brake line, ensuring to flare the ends correctly.

4. Replace Master Cylinder (if necessary)

Tools Required: Socket set, torque wrench, brake line wrench.
If the master cylinder is found to be faulty, remove it:
- Disconnect brake lines using line wrenches.
- Remove the master cylinder mounting bolts and take out the master cylinder.
Install the new master cylinder:
- Position the new master cylinder and tighten bolts to the manufacturer’s torque specifications.
- Reconnect brake lines and ensure they are properly secured and leak-free.

5. Bleed Brake System

Tools Required: Brake bleeder kit, clear tubing, container.
Start bleeding the brakes from the farthest wheel from the master cylinder (usually right rear):
- Attach the clear tubing to the bleeder screw and place the other end in a container.
- Open the bleeder screw and pump the brake pedal until fluid runs clear.
- Close the bleeder screw and repeat for each wheel in the following order: right rear, left rear, right front, left front.
Check brake fluid level and top off as necessary.