why is my Tesla Model S Original (2012-2020) leaking brake fluid

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

4 min read

618 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 fluid leaks in 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

•Disconnect the battery before working on the braking system.
•Allow the vehicle to be on a stable surface and use jack stands if lifting the vehicle.

Symptoms

•Brake fluid warning light illuminated on the dashboard
•Low brake fluid level in the reservoir
•Spongy or soft brake pedal feel
•Visible brake fluid puddle under the vehicle
•Unusual noises when pressing the brake pedal

Diagnostic Steps

1
Inspect the brake fluid reservoir for any cracks or damage.
2
Check brake lines for signs of wear, corrosion, or leaks.
3
Examine brake calipers and hoses for fluid leakage.
4
Verify the condition of the master cylinder for signs of leaking.
5
Perform a visual inspection of the brake booster for any fluid presence.
6
Use an OBD-II scanner to check for any related error codes.

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
•Rags
•O-ring seals (if applicable)
•Brake line wrench
•OBD-II scanner
•Bleeder kit

Parts Required

•Replacement brake line(s)
•Replacement brake caliper (if needed)
•Brake fluid (DOT 3 or DOT 4)

Related Faults

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Diagnostic Steps

1
Inspect the brake fluid reservoir for any cracks or damage.
2
Check brake lines for signs of wear, corrosion, or leaks.
3
Examine brake calipers and hoses for fluid leakage.
4
Verify the condition of the master cylinder for signs of leaking.
5
Perform a visual inspection of the brake booster for any fluid presence.
6
Use an OBD-II scanner to check for any related error codes.

Solution

1. Preparation

Gather tools and materials: socket set, brake fluid, rags, O-ring seals (if applicable), and a brake line wrench.
Ensure the vehicle is parked on a level surface and the ignition is off.
Disconnect the negative battery terminal to prevent any electrical issues.

2. Inspect and Replace Brake Lines

Inspect Brake Lines:
- Visually examine all brake lines for leaks or damage.
- If any line is compromised, note the specific location for replacement.
Replace Damaged Brake Line:
- Use a brake line wrench to disconnect the damaged line from the brake components.
- Install the new brake line, ensuring all connections are secure and properly torqued (as per manufacturer specifications).

3. Replace Brake Caliper (if leaking)

Remove the Wheel:
- Use a socket set to remove the lug nuts and take off the wheel.
Remove Brake Caliper:
- Unbolt the caliper from its mount using the appropriate socket size.
- Carefully disconnect the brake line from the caliper by loosening the fitting with a brake line wrench.
Install New Caliper:
- Attach the new caliper, ensuring all seals are in place.
- Reconnect the brake line and torque to specifications.
Reinstall Wheel:
- Place the wheel back on and hand-tighten the lug nuts before lowering the vehicle.

4. Refill Brake Fluid

Refill Reservoir:
- Open the brake fluid reservoir and fill it with the appropriate type of brake fluid (DOT 3 or DOT 4, as specified by manufacturer).
- Ensure the fluid level is above the minimum mark.

5. Bleed Brake System

Bleed Brakes:
- Start with the wheel farthest from the master cylinder (usually the rear passenger side).
- Attach a bleeder kit or hose to the bleeder valve and open it while someone presses the brake pedal.
- Allow old fluid to escape until new fluid is seen, then close the valve.
- Repeat this process for each wheel in the correct order (rear passenger, rear driver, front passenger, front driver).