my Tesla Model S Original (2012-2020) has a pulsating brake pedal when slowing down, why?

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

616 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 a pulsating brake pedal 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

•Disconnect the 12V battery before working on electrical systems.
•Allow brakes to cool down if the vehicle has been driven recently.

Symptoms

•Pulsating brake pedal during braking
•Reduced braking effectiveness
•Possible vibrations felt in the steering wheel
•Unusual noises (squeaking or grinding) during braking
•Increased stopping distance

Diagnostic Steps

1
Inspect brake pads for wear and uneven thickness.
2
Check brake rotors for warping or surface irregularities.
3
Examine brake calipers for proper operation and potential sticking.
4
Test brake fluid level and quality; look for contamination.
5
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

•Socket set
•Torque wrench
•Lug wrench
•Brake cleaner
•Brake rotor puller (if necessary)

Parts Required

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

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Inspect brake pads for wear and uneven thickness.
2
Check brake rotors for warping or surface irregularities.
3
Examine brake calipers for proper operation and potential sticking.
4
Test brake fluid level and quality; look for contamination.
5
Scan for any error codes related to the braking system using an OBD-II scanner.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the 12V battery to ensure safety while working on the braking system.

2. Inspect and Replace Brake Pads

Tools Required: Socket set, torque wrench, brake cleaner, and lug wrench.
Remove the wheels to access the brake components.
Inspect brake pads for uneven wear; replace if thickness is below 3mm or if uneven.
- Sub-steps:
  - Loosen the wheel nuts and remove the wheel.
  - Use the socket set to remove the caliper mounting bolts.
  - Slide the caliper off the rotor and support it with a bungee cord (do not let it hang by the brake line).
  - Remove the old brake pads and install new ones, ensuring they are correctly aligned.
  - Reinstall the caliper and torque the mounting bolts to the manufacturer’s specifications (typically around 25-30 Nm).

3. Inspect and Replace Brake Rotors

Tools Required: Brake rotor puller (if necessary), torque wrench.
Check the rotors for warping or deep grooves.
Replace rotors if they are warped beyond specification (usually over 0.5mm of runout).
- Sub-steps:
  - Remove the caliper as described above.
  - Remove the rotor by unscrewing any retaining screws or using a rotor puller if necessary.
  - Clean the hub surface before installing the new rotor.
  - Install new rotors, ensuring they are seated properly.
  - Reinstall the caliper and torque as previously described.

4. Brake System Fluid Check

Tools Required: Brake fluid tester (optional) or clear container.
Check the brake fluid level in the reservoir; replace fluid if it’s low or contaminated.
- Sub-steps:
  - Remove the brake fluid reservoir cap.
  - Use a tester or visually inspect fluid clarity; if cloudy or dark, replace.
  - Bleed the brake lines to remove any air bubbles, starting from the furthest brake line.
  - Refill the reservoir with the appropriate brake fluid (DOT 3 or DOT 4 as specified).