how to address Tesla Model S Original (2012-2020) fading brake performance

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

581 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 fading brake performance 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

•Allow the vehicle to cool down before working on the brakes to prevent burns.
•Always use jack stands when working underneath a vehicle.

Symptoms

•Reduced braking effectiveness
•Brake pedal feels soft or spongy
•Increased stopping distance
•Unusual noises when braking (squeaking or grinding)
•Brake warning light illuminated on the dashboard

Diagnostic Steps

1
Inspect brake fluid level and condition for contamination or low levels.
2
Check for air in the brake lines by performing a brake system bleed.
3
Examine brake pads for wear and ensure they are not worn down beyond the manufacturer's specifications.
4
Inspect brake rotors for warping, scoring, or excessive wear.
5
Test the brake booster for proper function and vacuum supply.
6
Scan for any error codes related to the braking system using an OBD-II scanner.

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
•Socket set
•Torque wrench
•Brake fluid tester
•Brake bleeder kit
•Vacuum gauge

Parts Required

•Brake fluid
•Brake pads
•Brake rotors (if necessary)
•Brake booster (if necessary)

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Diagnostic Steps

1
Inspect brake fluid level and condition for contamination or low levels.
2
Check for air in the brake lines by performing a brake system bleed.
3
Examine brake pads for wear and ensure they are not worn down beyond the manufacturer's specifications.
4
Inspect brake rotors for warping, scoring, or excessive wear.
5
Test the brake booster for proper function and vacuum supply.
6
Scan for any error codes related to the braking system using an OBD-II scanner.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is on a flat surface and engage the parking brake.
Disconnect the negative terminal from the battery.

2. Brake Fluid Inspection

Tools Required: Brake fluid tester, clean cloth
Check the brake fluid reservoir for proper fluid level.
Use a brake fluid tester to check for moisture content; if it exceeds 3%, replace the fluid.
If fluid is contaminated, proceed to replace it.

3. Brake System Bleeding

Tools Required: Brake bleeder kit, fluid catch container
Start with the furthest brake from the master cylinder (usually the right rear), and bleed until clear fluid flows without bubbles.
Repeat for the left rear, right front, and finally the left front brake.

4. Brake Pad and Rotor Inspection

Tools Required: Socket set, torque wrench
Remove the wheel using a socket set.
Inspect the brake pads for thickness; replace if less than 3mm.
Check the rotors for warping or scoring; replace if necessary.
If replacing pads or rotors, follow the manufacturer’s torque specifications for reassembly.

5. Brake Booster and Vacuum Check

Tools Required: Vacuum gauge
Inspect the brake booster for cracks or leaks.
Test the vacuum supply using a vacuum gauge; ensure it meets manufacturer specifications.
Replace the brake booster if it does not hold vacuum or has visible damage.

6. Reassembly and Testing

Reinstall the wheel and lower the vehicle.
Reconnect the negative battery terminal.
Test the brakes at low speeds to ensure proper function before driving at higher speeds.