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2017 Model X Brake Squeal and Pulsation After Rain

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Mike T. · rep 0 · May 25, 4:01 AM · 1 replies · solved · Question

Vehicle: 2017 Tesla Model X 90D

Hi everyone,

I'm experiencing some concerning brake issues with my 2017 Tesla Model X 90D. After driving in the rain, or even just after the car has been sitting overnight in damp conditions, I get a really loud squeal from the brakes when I first start driving and apply them. It eventually goes away after a few hard stops, but it's quite embarrassing.

More recently, I've also started to feel a pulsation in the brake pedal when braking at higher speeds, which is new. The car has about 70,000 miles on it, and I'm not sure when the pads and rotors were last replaced. Could these issues be related? What should I be looking for?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:01 AM

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ClearTheCode admin answer:

Brake squeal and pulsation are common brake concerns, and their combination suggests a need for a thorough brake system inspection. Both issues can affect braking performance and safety.

Common Causes:

  1. Brake Squeal (especially after rain/dampness):

    • Surface Rust: This is the most common cause for initial squealing after rain or sitting. A thin layer of rust forms on the rotors, which is quickly scrubbed off with the first few brake applications, causing the noise to disappear.
    • Worn Pads: If the squealing persists or becomes constant, it could indicate worn brake pads. Many pads have a wear indicator (a small metal tab) that scrapes against the rotor when the pad material is low.
    • Glazed Pads/Rotors: Overheating can cause the pad material or rotor surface to become glazed, leading to noise.
    • Caliper Issues: A sticky or seized brake caliper can cause a pad to drag, leading to constant squealing and uneven wear.

  2. Brake Pulsation (in pedal):

    • Warped Rotors: This is the most frequent cause of brake pedal pulsation. Uneven heating and cooling can cause the rotors to develop thickness variations or runout, leading to a pulsing sensation as the pads contact the uneven surface.
    • Worn Suspension Components: While less common for direct pedal pulsation, worn wheel bearings, tie rods, or control arm bushings can sometimes exacerbate a vibration felt during braking.
    • Tire Imbalance/Defect: If the pulsation is also felt through the steering wheel and is constant, even without braking, it could be related to tire balance or a damaged tire.

When to See a Shop:

  1. Immediate Inspection: The combination of persistent squealing (beyond initial rust) and pedal pulsation warrants an immediate inspection by a qualified technician. Pulsation indicates a compromised braking surface, which affects stopping power and control.
  2. Diagnosis: A technician will inspect all brake components, including:
    • Pad thickness: To check for wear.
    • Rotor condition: To check for warping, scoring, or excessive wear (using a micrometer for thickness variation).
    • Caliper function: To ensure they are moving freely and not seizing.
    • Brake fluid: To check level and condition.
  3. Potential Repairs: Depending on the findings, you might need new brake pads, rotor replacement (or resurfacing if possible, though often replacement is recommended for Teslas due to their performance), or even caliper service/replacement. If the issue is severe and affecting ABS or traction control, a system warning might appear on your screen, potentially accompanied by a Tesla-specific diagnostic code that a service center can read.

Do not ignore brake pulsation, as it can compromise your vehicle's ability to stop safely.

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