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2018 Lexus RX 350 F Sport - Persistent Squealing Brakes After Pad Replacement

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Sarah K. · rep 0 · May 25, 3:27 AM · 1 replies · solved · Question

Vehicle: 2018 Lexus RX 350 F Sport

Hey everyone,

I'm looking for some advice on my 2018 Lexus RX 350 F Sport. About a month ago, I had the front brake pads replaced at an independent shop. Ever since then, I've been experiencing a persistent, high-pitched squeal, especially when coming to a stop at low speeds. It's really noticeable and quite annoying.

The shop assured me they used quality pads and checked the rotors, saying they were within spec. I've tried bedding them in a few times, but the noise keeps coming back. It doesn't feel like there's any loss of braking performance, just this awful sound.

Could it be something they missed? Or is this just a characteristic of new pads on an older rotor? Any thoughts or similar experiences with your RX models would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:27 AM

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ClearTheCode admin answer:

Persistent squealing after brake pad replacement is a common complaint, and while sometimes it's normal during the break-in period, it shouldn't last indefinitely. Here's a breakdown of potential causes and steps to consider:

  1. Pad Material & Type: Some aftermarket brake pads, especially performance-oriented ones, can be noisier than OEM pads. The material composition plays a big role. Ensure the pads used are ceramic or low-metallic if you prefer quieter operation.
  2. Rotor Condition: Even if 'within spec,' rotors can develop minor imperfections or glazing that don't mate perfectly with new pads, leading to noise. If the rotors weren't resurfaced or replaced, this is a likely culprit. Warped rotors can also cause squealing or pulsing.
  3. Caliper Slide Pins: If the caliper slide pins are seized, corroded, or not properly lubricated, the caliper won't move freely, causing uneven pad wear and noise. This is a crucial step during any brake job.
  4. Anti-Squeal Shims/Grease: Most brake pads come with anti-squeal shims, and applying a specific high-temperature brake grease to the back of the pads (where they contact the caliper piston and bracket) is essential to dampen vibrations that cause squealing.
  5. Improper Bedding-In: While you mentioned trying to bed them in, an improper or incomplete bedding-in process can leave a thin layer of pad material unevenly deposited on the rotor, leading to noise.

When to See a Shop:

  • If the squealing persists after a few hundred miles and proper bedding-in attempts.
  • If you notice any pulsing in the brake pedal, which could indicate warped rotors.
  • If the noise is accompanied by a change in braking performance or feel.
  • If you suspect the caliper slide pins were not serviced or the wrong pads/shims were used.

It's advisable to take it back to the shop that performed the work. They should re-inspect the brake system, specifically checking the rotor run-out, caliper function, and ensuring all anti-squeal measures were correctly applied. Sometimes, simply removing the pads, cleaning everything, and reassembling with fresh grease can resolve the issue.

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