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What Are the Masses Seen on the Brakes of the Peugeot 508?

Model: Peugeot 508 MK 2 - Years: 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Part: Wheel

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The masses highlighted in the video, which the YouTuber inquires about, are not systems for regenerative braking as one might think, because this component is located in the electric motor of the car, which is connected to the wheels. Indeed, when you release the accelerator or brake, the car's kinetic energy is used to turn the electric motor, which in this phase acts as a dynamo.

The rotation generates electricity that is sent to the battery to recharge it. Therefore, the small 'masses' we see attached to the brake caliper are positioned to just touch the surface of the disc when they are new, and they squeal with a high-pitched sound when the brake pads are worn out and need replacing: a purely mechanical system that is very effective.


Posted on 26 May 2026 by ScegliAuto


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