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2021 Outlander PHEV GT - Premature Brake Wear & Squealing

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Ryan M. · rep 0 · May 22, 5:37 AM · 1 replies · solved · Question

Vehicle: 2021 Mitsubishi Outlander PHEV GT

Hi all,

I'm an owner of a 2021 Mitsubishi Outlander PHEV GT, and I'm a bit concerned about my brakes. I've only got about 35,000 miles on it, and I'm already experiencing significant brake squealing, especially at lower speeds. It's quite loud and embarrassing. I also feel like the brake pads are wearing out much faster than they should, given that it's a PHEV with regenerative braking.

I thought the regenerative braking system was supposed to extend the life of the conventional brake pads, but mine seem to be going quickly. Is this normal for the Outlander PHEV, or could there be an underlying issue? What should I be looking for, and what's the typical brake life for these vehicles?

Any insights from other PHEV owners or Mitsubishi experts would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:37 AM

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You've hit on a common point of confusion with PHEVs and their braking systems. While regenerative braking does reduce wear on the friction brakes, premature wear and squealing can still occur. Here's what might be happening with your 2021 Outlander PHEV GT:

  1. Brake Pad Material: Some OEM brake pads can be prone to squealing, especially if they are a harder compound or if they've been glazed from heavy braking. Aftermarket pads might offer different performance characteristics.
  2. Rotor Condition: Uneven wear, rust, or a lip on the edge of the rotors can cause squealing and contribute to premature pad wear. Rotors should be inspected for runout and thickness.
  3. Caliper Issues: A sticking brake caliper can cause a pad to remain in contact with the rotor, leading to constant friction, rapid wear, and squealing. This can also lead to uneven wear across the pads.
  4. Lack of Use (Paradoxical Wear): Ironically, because regenerative braking is so effective, the friction brakes on PHEVs sometimes don't get used as much. This can lead to rust buildup on the rotors or the pads not 'cleaning' the rotors effectively, resulting in noise. Regular, firm braking (when safe) can help keep the friction components in good condition.
  5. Brake Hardware: Worn or missing anti-rattle clips, shims, or caliper pins can cause pads to vibrate and squeal.

When to See a Shop: Given the squealing and your concern about premature wear at 35,000 miles, it's essential to have your brakes professionally inspected. A qualified technician can:

  • Inspect Pads and Rotors: Determine the actual wear level of your pads and rotors and check for any uneven wear or damage.
  • Check Calipers: Ensure all calipers are functioning correctly and not sticking.
  • Lubricate Components: Clean and lubricate caliper pins and contact points to prevent noise and ensure smooth operation.
  • Diagnose Noise Source: Pinpoint the exact cause of the squealing, which could be anything from a simple lubrication issue to a component needing replacement. Ignoring persistent brake noise can compromise braking performance and safety.
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