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Persistent Brake Squeal on 2021 R1T at Low Speeds

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Mike T. · rep 0 · May 25, 5:07 AM · 1 replies · solved · Question

Vehicle: 2021 Rivian R1T Launch Edition

My 2021 Rivian R1T Launch Edition has developed a really annoying squeal from the brakes, especially when coming to a stop at low speeds. It's not constant, but it's quite loud and happens almost every time I brake gently.

I thought EVs wouldn't have this problem as much due to regenerative braking reducing the use of friction brakes. This makes me wonder if something is wrong. The squeal seems to be coming from the front wheels.

Is this normal for an early model R1T, or do I need to get them checked? I'm worried about potential wear or damage.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:07 AM

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ClearTheCode admin answer:

While EVs like your 2021 Rivian R1T rely heavily on regenerative braking, friction brakes are still essential and can develop noise, even with less frequent use. A persistent squeal, especially at low speeds, is a common complaint.

Common Causes of Brake Squeal in EVs:

  • Rust/Glazing on Rotors: Because friction brakes are used less often in EVs, the rotors can develop a thin layer of rust or glaze from lack of use. This can cause squealing until the rust/glaze is worn off by harder braking.
  • Brake Pad Material: The specific compound of the brake pads can sometimes cause noise, especially if they are metallic or semi-metallic. Some pads are simply noisier than others.
  • Pad Wear Indicators: If your brake pads are significantly worn, a small metal tab (wear indicator) will contact the rotor, producing a high-pitched squeal to alert you that replacement is needed.
  • Contamination: Dirt, dust, road grime, or even brake fluid can contaminate the pads and rotors, leading to noise.
  • Improper Installation/Bedding: If pads or rotors were recently replaced, improper installation or failure to properly 'bed' the new components can lead to noise.
  • Loose Components: Caliper bolts, shims, or other brake components that are loose or vibrating can also cause squealing.

Potential OBD Codes:

  • Brake squeal itself does not typically trigger OBD codes. However, if brake pad wear sensors are present and triggered, you might see a general brake system warning light, but this is less common for just noise.

What You Can Do:

  1. Perform Harder Stops (Safely): Find a safe, open area and perform a few firm, controlled stops from moderate speeds (e.g., 40-50 mph down to 10 mph). This can help clean off rust or glaze from the rotors.
  2. Visual Inspection: If comfortable, visually inspect the brake pads and rotors through the wheel spokes. Look for excessive rust, deep grooves in the rotors, or very thin pads.
  3. Brake Cleaning: Sometimes, a professional brake cleaning service can remove accumulated dust and debris that causes noise.

When to See a Shop:

  • Soon: If the squeal is persistent, does not go away after a few harder stops, or if you notice any other symptoms like reduced braking performance, a pulsing pedal, or a grinding noise. A Rivian service center or qualified technician can inspect your brake system, check pad wear, assess rotor condition, and ensure all components are properly installed and functioning. Addressing brake noise early can prevent more significant wear or damage.
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