what should I do if my Tesla Model S Original (2012-2020) brake pedal goes to the floor

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

3-5 hours

Time

hard

Difficulty

critical

Severity

4 min read

697 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 brake pedal issues in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Brakes

Estimated Time

3-5 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 brakes.

Symptoms

•Brake pedal feels soft or spongy when pressed
•Extended stopping distance
•Warning lights illuminated on the dashboard
•Brake fluid leak under the vehicle
•Unusual noises when applying brakes (e.g., grinding or squeaking)

Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in the brake lines and around the brake calipers.
3
Scan the vehicle's computer for any error codes related to the braking system using an OBD-II scanner.
4
Perform a visual inspection of the brake pads and rotors for excessive wear.
5
Test the brake booster operation by pumping the brake pedal and observing if it feels firm.

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

•Socket set
•Brake fluid
•OBD-II scanner
•Brake line wrench
•Turkey baster or brake fluid siphon
•Clear hose for bleeding

Parts Required

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

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Diagnostic Steps

1
Inspect brake fluid level in the master cylinder reservoir.
2
Check for visible leaks in the brake lines and around the brake calipers.
3
Scan the vehicle's computer for any error codes related to the braking system using an OBD-II scanner.
4
Perform a visual inspection of the brake pads and rotors for excessive wear.
5
Test the brake booster operation by pumping the brake pedal and observing if it feels firm.

Solution

1. Preparation

Tools Required: Socket set, brake fluid, OBD-II scanner, brake line wrench.
Ensure the vehicle is parked on a level surface and set the parking brake.
Disconnect the battery to prevent electrical issues during repairs.

2. Check and Replace Brake Fluid

Sub-steps:
1. Remove the cap from the brake fluid reservoir.
2. Inspect the fluid for contamination; it should be clear to light amber.
3. If dirty, siphon out the old fluid using a turkey baster or brake fluid siphon.
4. Fill the reservoir with fresh brake fluid that meets OEM specifications (usually DOT 3 or DOT 4).
5. Reconnect the reservoir cap securely.

3. Inspect and Repair Brake Lines

Sub-steps:
1. Visually inspect all brake lines for wear, corrosion, or damage.
2. If leaks are found, use a brake line wrench to disconnect the affected section.
3. Replace damaged sections with new brake lines, ensuring proper fittings are used.
4. Bleed the brakes to remove any air from the system (refer to bleeding procedure below).

4. Replace Brake Pads and Rotors (if necessary)

Sub-steps:
1. Remove the wheel to access the brake caliper.
2. Use a socket set to remove the caliper bolts and gently slide the caliper off the rotor.
3. Remove the old brake pads and inspect the rotors for warping or excessive wear.
4. If the rotors are worn, replace them with new ones, ensuring they are properly torqued to manufacturer specifications.
5. Install new brake pads and reassemble the caliper.

5. Bleed the Brake System

Sub-steps:
1. Start with the wheel farthest from the master cylinder (typically the rear passenger side).
2. Attach a clear hose to the bleeder valve on the brake caliper and place the other end into a container.
3. Have an assistant pump the brake pedal several times and hold it down.
4. Open the bleeder valve to allow fluid and air to escape, then close it before your assistant releases the pedal.
5. Repeat until no air bubbles appear in the fluid, then move to the next wheel.
6. Check the brake fluid level and add more as necessary throughout the bleeding process.