Whether you're chasing lap times or just want peace of mind on a spirited Sunday drive, selecting the right brake fluid matters. Motul’s RBF range is engineered for high-performance applications, but each variant has its own sweet spot. Let’s break it down.
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Motul RBF600 – The Track-Day Favourite
Use Case:
- Ideal for fast road use, track days, and club-level motorsport
- Compatible with all hydraulic brake and clutch systems requiring non-silicone synthetic fluid
Why Choose It:
- Dry boiling point: ~312°C
- Wet boiling point: ~205°C
- Excellent value and performance for most enthusiast setups
- Less aggressive on seals and components than higher-spec fluids
- Suitable for vehicles with conventional steel brakes and decent cooling
Considerations:
- More hygroscopic than standard DOT 4, so annual fluid changes are recommended
- Overkill for daily drivers, but a solid upgrade for those who push their cars occasionally
Motul RBF660 – Built for Serious Heat
Use Case:
- Designed for racing applications with carbon or ceramic brakes
- Also suitable for high-performance road cars with limited brake cooling
Why Choose It:
- Dry boiling point: ~325°C
- Wet boiling point: ~205°C
- Withstands extreme temperatures without vapour lock
- Ideal for endurance racing, hill climbs, or heavy track use
Considerations:
- Higher performance means more frequent fluid changes (typically every 12 months)
- Slightly more expensive than RBF600, but worth it if you're pushing hard
Motul RBF700 – Maximum Performance, Minimum Compromise
Use Case:
- Motul’s highest-performing brake fluid, developed for GT racing and extreme motorsport
- Perfect for vehicles with carbon/ceramic brakes and minimal cooling
Why Choose It:
- Dry boiling point: ~336°C
- Wet boiling point: ~205°C
- Offers the most consistent braking performance under severe conditions
- Outperforms many premium fluids when fresh, including Castrol SRF
Considerations:
- Best suited to race cars or heavily modified track builds
- Not necessary for casual track days or road use
- Like all high-performance fluids, it absorbs moisture quickly — regular flushing is key
The Round Up
If you're a weekend warrior or track-day regular, RBF600 is likely all you need. For those chasing podiums or running high-temp setups, RBF660 or RBF700 offer peace of mind when the brakes are glowing. Just remember: the higher the performance, the more diligent you need to be with maintenance.