# ABS (anti-lock braking system)

> 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.

- **Also known as:** Anti-lock Braking System, Kilitlenme önleyici fren, ABS sensörü
- **Turkish term:** ABS
- **Category:** [Brake System](https://motorsikletparcasi.com/en/category/brake-system)
- **Page:** https://motorsikletparcasi.com/en/glossary/abs

The system consists of wheel **speed sensors**, the toothed **tone rings** they read and an **ABS unit** that modulates hydraulic pressure. In the European Union ABS is mandatory on new motorcycles over 125 cc.

- If the ABS warning light stays on, the system is disabled; normal braking works but there is no anti-lock protection.
- Common causes: a dirty or damaged sensor, a cracked tone ring, a loose connector, low battery voltage.
- Tyres of a different diameter or the wrong tone ring can make ABS misread wheel speed.

## Related terms

- [Brake disc](https://motorsikletparcasi.com/en/glossary/brake-disc): The brake disc is the steel rotor fixed to the wheel that the brake pads clamp 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.
- [Tyre size](https://motorsikletparcasi.com/en/glossary/tyre-size): A tyre size is the code giving tread width (mm), aspect ratio (%) and rim diameter (inches), e.g. 120/70-17.

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- Source page: https://motorsikletparcasi.com/en/glossary/abs
- Last updated: 2026-10-09
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