Tesla Model S Original (2012-2020) brake pedal goes to the floor what to check

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

647 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 diagnostic procedures and repair instructions.

Affected Component

Brakes

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on the electrical components.
•Ensure the vehicle is secure and on a flat surface to avoid rolling.

Symptoms

•Brake pedal feels soft or spongy
•Brake warning light illuminated on the dashboard
•Reduced braking effectiveness
•Fluid leakage around brake components
•Unusual noises when braking (e.g., grinding or squealing)

Diagnostic Steps

1
Inspect brake fluid level in the reservoir.
2
Check for any visible leaks in brake lines or at brake calipers.
3
Scan the vehicle’s electronic control unit (ECU) for any fault codes related to the braking system.
4
Examine the brake pads and rotors for wear and damage.
5
Inspect the brake master cylinder for signs of failure or leaks.
6
Test the brake booster operation by pressing the brake pedal multiple times with the engine off and then starting the engine to see if the pedal drops slightly.

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 fluid
•Wrench set
•Socket set
•Brake line tool
•Brake bleeder kit

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Replacement brake lines (if necessary)
•New brake master cylinder (if necessary)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level in the reservoir.
2
Check for any visible leaks in brake lines or at brake calipers.
3
Scan the vehicle’s electronic control unit (ECU) for any fault codes related to the braking system.
4
Examine the brake pads and rotors for wear and damage.
5
Inspect the brake master cylinder for signs of failure or leaks.
6
Test the brake booster operation by pressing the brake pedal multiple times with the engine off and then starting the engine to see if the pedal drops slightly.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative terminal of the battery to prevent electrical shorts.

2. Inspect and Replace Brake Fluid

Tools Required: Brake fluid, funnel, and clean rags.
Remove the brake fluid reservoir cap and inspect the fluid level.
If low, fill with the recommended brake fluid (DOT 3 or DOT 4), ensuring it does not exceed the max line. Clean any spills immediately.
Check for contamination in the fluid; if dirty, proceed to flush the brake system.

3. Replace Brake Lines if Leaking

Tools Required: Wrench set, brake line tool, and brake line fittings.
Locate the source of the leak in the brake lines or fittings.
Use the wrench to disconnect the damaged section of brake line.
Measure and cut a new brake line to the appropriate length, then attach using the brake line tool and fittings.
Bleed the brake lines to remove air.

4. Inspect and Replace Brake Master Cylinder (if necessary)

Tools Required: Socket set, brake fluid, and wrench set.
Locate the master cylinder on the brake booster.
Disconnect brake lines from the master cylinder and remove the mounting bolts.
Replace with a new master cylinder, ensuring proper alignment and tightening to manufacturer specifications (usually around 15-20 ft-lbs).
Reconnect brake lines and refill the brake fluid reservoir.

5. Bleed Brakes

Tools Required: Brake bleeder kit or a second person.
Starting from the wheel furthest from the master cylinder, open the bleeder valve on the brake caliper.
Have an assistant pump the brake pedal, holding it down while you close the valve, then release the pedal.
Repeat until no air bubbles appear, then move to the next wheel in sequence (farthest to closest).