Collection: Brake fluids

DOT 3, DOT 4 and DOT 5.1 brake fluids – how to choose the right one

Brake fluid transfers pressure in the hydraulic braking system, so its properties directly affect safety. This category includes DOT 3, DOT 4 and DOT 5.1 fluids in pack sizes suitable for topping up or servicing the system.

What do DOT grades mean?

DOT grades set requirements for boiling points, viscosity and other fluid properties. A higher number is not automatically better. It is particularly important to distinguish silicone-based DOT 5 from DOT 5.1, which generally belongs to a different chemical family. Always use the grade and specification required by the vehicle manufacturer.

When should brake fluid be replaced?

Many brake fluids are hygroscopic, meaning they absorb moisture from the surroundings. Over time, this can lower the boiling point and promote corrosion in the system. Follow your vehicle's service schedule and assess the fluid's condition; checking the reservoir level alone is not enough.

What precautions should you take when topping up?

Check the reservoir cap and vehicle manual, use clean tools and prevent contamination. Do not mix fluids unless compatibility is confirmed. Incorrect bleeding or a leaking system requires repair. Brake fluid can damage paintwork; remove spills immediately according to the manufacturer's instructions.