why does my Tesla Model S Original (2012-2020) make a hissing sound when I brake

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

508 words

Problem Statement

Learn how to diagnose and fix the hissing sound when braking 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 battery before working on electrical systems.
•Allow the vehicle to cool down before performing maintenance.

Symptoms

•Hissing noise when applying brakes
•Potential decrease in braking performance
•Brake pedal feels different or spongy
•Increased brake dust accumulation on wheels
•Warning lights on the dashboard (if applicable)

Diagnostic Steps

1
Inspect brake fluid levels in the master cylinder reservoir.
2
Use an OBD-II scanner to check for error codes related to the braking system.
3
Visually inspect brake calipers and pads for wear or damage.
4
Check for air leaks in the brake booster system.
5
Test brake booster operation by pumping the brake pedal with the engine off, then starting the car to observe if the pedal goes down further.
6
Inspect brake lines for any signs of leaks or damage.

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
•Brake fluid
•Jack and jack stands
•Socket set
•Torque wrench

Parts Required

•Brake pads (if worn)
•Brake fluid (if low)
•Vacuum lines (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect brake fluid levels in the master cylinder reservoir.
2
Use an OBD-II scanner to check for error codes related to the braking system.
3
Visually inspect brake calipers and pads for wear or damage.
4
Check for air leaks in the brake booster system.
5
Test brake booster operation by pumping the brake pedal with the engine off, then starting the car to observe if the pedal goes down further.
6
Inspect brake lines for any signs of leaks or damage.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the negative battery terminal to ensure safety.

2. Check Brake Fluid

Remove the master cylinder reservoir cap.
Inspect brake fluid level; refill with the manufacturer's specified brake fluid if low.
Replace the cap securely after checking.

3. Inspect and Replace Brake Pads (if necessary)

Lift the vehicle using a jack and secure with jack stands.
Remove the wheel to access the brake assembly.
Inspect the brake pads for wear; if they are worn below the minimum thickness, replace them.
- Remove the caliper bolts and slide the caliper off the rotor.
- Replace the brake pads, making sure to apply anti-squeal lubricant on the back of the pads.
Reinstall the caliper and torque bolts to manufacturer specifications.

4. Inspect Brake Booster and Vacuum Lines

Locate the brake booster and visually inspect it for cracks or leaks.
Check the vacuum lines connected to the brake booster for signs of wear or disconnection.
Replace any damaged components as necessary.

5. Reassemble and Test

Reinstall the wheel and lower the vehicle.
Reconnect the negative battery terminal.
Test the brakes to ensure the hissing sound is resolved and performance is restored.