Brake fluid Audi A4 B9 (2015–2023) — DOT4 specification
Brake fluid for Audi A4 B9 (2015–2023) — required specification, boiling points, system volume, and approved brands.
Especificaciones técnicas
| Parameter | Value |
|---|---|
| Marca / Modelo | Audi A4 B9 |
| Años de producción | 2015–2023 |
| Especificación del líquido | DOT4 |
| Punto de ebullición seco | 230°C |
| Punto de ebullición húmedo | 155°C |
| Volumen del sistema | 600 ml |
| Intervalo de cambio | 30 000 km / años |
Marcas aprobadas
Audi/VW DOT4, ATE SL.6, Liqui Moly DOT4
Why Brake Fluid Must Be Changed Regularly
Brake fluid is hygroscopic — it absorbs moisture from the air over time. As moisture content increases, the boiling point drops significantly. When the fluid boils under heavy braking, vapour bubbles form and the pedal goes to the floor (vapour lock). Audi requires DOT4 with a dry boiling point of at least 230°C.
How to Check Brake Fluid Condition
- Test strips — dip a strip in the reservoir; colour indicates moisture content
- Electronic tester — measures boiling point directly (most accurate)
- Visual inspection — dark/brown fluid indicates it must be replaced (fresh fluid is amber/clear)
Preguntas frecuentes
What brake fluid does Audi A4 B9 use?
DOT4 specification. Punto de ebullición seco: 230°C. Volumen del sistema: 600 ml. Marcas aprobadas: Audi/VW DOT4, ATE SL.6, Liqui Moly DOT4.
How often should I change brake fluid in Audi A4 B9?
Every 30 000 km or every años — whichever comes first. This is a safety-critical service.
Can I mix different DOT grades?
You can mix DOT 3 and DOT 4 in an emergency, but never mix DOT 5 (silicone-based) with DOT 3/4 (glycol-based). Always use the correct specification: DOT4.
Dónde comprar