my Tesla Model S Original (2012-2020) has poor braking performance, what’s wrong?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

554 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 poor braking 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

•Disconnect battery before working on electrical systems.
•Allow brakes to cool before inspection or repairs.

Symptoms

•Brake pedal feels spongy or soft
•Increased stopping distance
•Brake warning light illuminated on the dashboard
•Unusual noise when braking (squeaking or grinding)
•Vibration or pulsation in the brake pedal
•Brake fluid leak observed under the vehicle

Diagnostic Steps

1
Inspect brake fluid level in the reservoir; top off if low.
2
Use an OBD-II scanner to check for any error codes related to the braking system.
3
Visually inspect brake pads for wear; measure thickness.
4
Examine brake rotors for warping or scoring.
5
Check for leaks in brake lines and connections.
6
Test brake booster operation to ensure proper vacuum pressure.

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
•Brake bleeder kit
•Torque wrench
•Pliers

Parts Required

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

Related Faults

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Diagnostic Steps

1
Inspect brake fluid level in the reservoir; top off if low.
2
Use an OBD-II scanner to check for any error codes related to the braking system.
3
Visually inspect brake pads for wear; measure thickness.
4
Examine brake rotors for warping or scoring.
5
Check for leaks in brake lines and connections.
6
Test brake booster operation to ensure proper vacuum pressure.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is on a flat surface and secure it with wheel chocks.
Disconnect the negative battery terminal to ensure safety.

2. Inspect and Replace Brake Pads

Sub-steps:
1. Remove the wheel using a socket set.
2. Inspect the brake calipers and pads for wear; replace if thickness is below 3mm.
3. Remove the caliper bolts with the appropriate socket size.
4. Slide the caliper off the rotor and support it without straining the brake line.
5. Remove old brake pads from the caliper bracket and replace with new pads.
6. Reinstall the caliper over the new pads and tighten bolts to manufacturer specifications (usually around 25-30 Nm).

3. Inspect and Replace Brake Rotors (if necessary)

Sub-steps:
1. Check the rotor thickness; replace if below minimum specification (typically 24mm for Tesla).
2. Remove the caliper as previously mentioned.
3. Take off the rotor by removing the retaining screws if applicable.
4. Install the new rotor and secure it according to specifications.
5. Reassemble the caliper and wheel.

4. Brake Fluid Replacement

Sub-steps:
1. Remove the brake fluid reservoir cap.
2. Use a brake bleeder kit to flush old fluid out of the system.
3. Fill the reservoir with new brake fluid (DOT 3 or DOT 4 as specified).
4. Bleed each brake line starting from the furthest wheel to the closest, ensuring all air is removed.

5. Recheck and Reassemble

Sub-steps:
1. Reinstall the wheel and secure with lug nuts.
2. Lower the vehicle and reconnect the negative battery terminal.
3. Check brake pedal feel; it should feel firm.