my Tesla Model S Original (2012-2020) brakes feel spongy what should I do

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

522 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 spongy brakes on Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, 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 use wheel chocks to prevent rolling.
•Disconnect the battery before working on the electrical components.
•Ensure the vehicle is securely supported before working on the brakes.
•Allow the vehicle to cool down before working on brake components to avoid burns.

Symptoms

•Spongy brake pedal feel
•Increased stopping distance
•Brake warning light illuminated on the dashboard
•Unusual noise when braking (e.g., squeaking or grinding)
•Brake fluid leaks underneath the vehicle
•Brake pedal vibrates when pressed

Diagnostic Steps

1
Inspect the brake fluid level in the reservoir.
2
Check for any visible leaks around brake lines, calipers, and the master cylinder.
3
Use an OBD-II scanner to check for any error codes related to the braking system.
4
Test the brake pedal feel with the engine off and then with the engine on.
5
Inspect the brake pads and rotors for wear and damage.
6
Examine the brake lines for bulges or signs of wear.

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
•Brake bleeder kit
•Wrench set
•OBD-II scanner

Parts Required

•Brake fluid (DOT 3 or DOT 4)
•Brake pads (if worn)
•Brake rotors (if damaged)

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Diagnostic Steps

1
Inspect the brake fluid level in the reservoir.
2
Check for any visible leaks around brake lines, calipers, and the master cylinder.
3
Use an OBD-II scanner to check for any error codes related to the braking system.
4
Test the brake pedal feel with the engine off and then with the engine on.
5
Inspect the brake pads and rotors for wear and damage.
6
Examine the brake lines for bulges or signs of wear.

Solution

1. Preparation

Tools Required: Socket set, brake fluid, brake bleeder kit, wrench set, OBD-II scanner.
Safety Warnings: Ensure the vehicle is on a flat surface and use wheel chocks to prevent rolling. Disconnect the battery before working on the electrical components.

2. Check and Replace Brake Fluid

Locate the brake fluid reservoir and inspect the fluid level.
If low, add the appropriate type of brake fluid (DOT 3 or DOT 4).
If the fluid is dark or contaminated, proceed to replace it:
- Remove the reservoir cap and siphon out old fluid.
- Refill with new brake fluid.

3. Bleed the Brake System

Attach the brake bleeder kit to the brake caliper.
Have an assistant pump the brake pedal several times and hold it down.
Open the bleeder valve to allow old fluid and air to escape; close the valve before releasing the pedal.
Repeat this process until clear fluid without bubbles is seen.
Ensure all four wheels are bled.

4. Inspect and Replace Brake Pads and Rotors (if necessary)

Remove the wheel to access the brake assembly.
Inspect the brake pads for thickness; replace if worn below 3mm.
Check the rotors for scoring or warping; replace if necessary.
Use a torque wrench to install new pads and rotors according to manufacturer specifications.