# Brake disc

> The brake disc is the steel rotor fixed to the wheel that the brake pads clamp to slow the motorcycle.

- **Also known as:** Disk, Fren rotoru, Brake rotor
- **Turkish term:** Fren diski
- **Category:** [Brake Pads & Discs](https://motorsikletparcasi.com/en/category/brake-pads-and-discs)
- **Page:** https://motorsikletparcasi.com/en/glossary/brake-disc

Discs can be **fixed** (one piece) or **floating** (an outer ring joined to an inner carrier with rivets); wave-edged designs aim at heat dissipation and looks.

- Every disc is stamped with a minimum thickness (e.g. "MIN TH 4.0"); replace it below that value.
- A warped disc (run-out) causes pulsing at the lever when braking.
- Deep scoring wears pads quickly; fit new pads whenever you replace a disc.

## Related terms

- [Brake pad](https://motorsikletparcasi.com/en/glossary/brake-pad): A brake pad is the friction-lined part that the caliper pistons press against the brake disc to slow the motorcycle.
- [Brake caliper](https://motorsikletparcasi.com/en/glossary/brake-caliper): A brake caliper uses hydraulic pressure to move its pistons and press the brake pads onto the disc.
- [ABS (anti-lock braking system)](https://motorsikletparcasi.com/en/glossary/abs): ABS (anti-lock braking system) detects a wheel about to lock under hard braking and modulates brake pressure many times a second to keep grip.

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- Source page: https://motorsikletparcasi.com/en/glossary/brake-disc
- Last updated: 2026-10-09
- Türkçe sürüm: https://motorsikletparcasi.com/sozluk/fren-diski.md
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