Brake Fluid

About

Motorcycle brake fluid is the difference between a firm lever and a fade-prone one. This range covers Motul, Putoline and Ipone in DOT 4, DOT 5.1 and dedicated racing specs. Pick the grade your master cylinder calls for, match the boiling point to your riding, and keep braking response sharp on the street and at the track. Choosing the right brake fluid grade Brake fluid grade is set by your master cylinder, not personal preference. DOT 4 and DOT 5.1 are both glycol-based and mix safely with each other. DOT 5.1 carries a higher boiling point for harder use. Racing fluids like Motul RBF600 and RBF700 push dry boiling points well beyond the minimums for repeated hard stops. Grade Min dry boiling point Min wet boiling point Best for DOT 4 230 C 155 C Street and commuting DOT 5.1 260 C 180 C Sport and touring Motul RBF600 312 C 216 C Track days Motul RBF700 336 C 205 C Racing Why boiling point matters Glycol fluid absorbs moisture over time, dropping the wet boiling point and inviting fade. A fluid sitting at 3.5% water content loses a large share of its margin. Flush every 1 to 2 years on the street, and after every race weekend on track. Most of these come in 500 mL bottles, enough to bleed a 2-line system fully. Mixing rules DOT 4 and DOT 5.1 are compatible because both are glycol-ether based. DOT 5 is silicone-based and must never be mixed with the others. Putoline offers DOT 4 and a DOT 5.1 option, while Ipone X-Trem runs a high-spec DOT 4. Always bleed until clean fluid runs clear at every caliper. Related: Engine Oil · Motul · Putoline · IPONE · All Workshop Tools & Stands Frequently asked questions Can I mix DOT 4 and DOT 5.1 brake fluid? Yes. DOT 4 and DOT 5.1 are both glycol-ether based and mix safely. DOT 5.1 simply runs a higher boiling point. Never mix either with silicone-based DOT 5, which is a different chemistry entirely. What is the difference between Motul RBF600 and RBF700? Both are racing fluids. RBF600 carries a 312 C dry boiling point, while R