Motul (Racing Brake Fluid) RBF 700 500 ML

Description

Motul RBF 700 Factory Line

Motul RBF 700 is a 100% synthetic racing brake fluid for hydraulic brake and clutch systems. It boils at 637°F (336°C) dry and 401°F (205°C) wet, well above the minimums for DOT 4 and DOT 5.1. It meets FMVSS 116 DOT 4 and is compatible with systems specified for DOT 3, DOT 4, or DOT 5.1 glycol fluid. Do not mix it with DOT 5 silicone fluid.

Is RBF 700 right for you?

Choosing brake fluid is mostly about how hard you use the brakes, and how often you want to flush.

RBF 700 is the fluid for aggressive street riding and occasional track days. Under normal street use it holds its performance for about six to twelve months before a flush. On a race weekend, change it after the event. High-boiling fluids are at their best when they are fresh.

Its dry and wet boiling points are far above conventional DOT 4 and DOT 5.1, so the pedal stays firm when the brakes get hot. That is the gap it fills: extreme temperature resistance without a flush every few weeks on the street.

Dry and wet boiling points

Get brake fluid hot enough and it starts to produce vapour. Vapour compresses. Fluid does not. That is brake fade: the lever or pedal sinks under hard, repeated use, even though the pads and discs are still there.

Glycol brake fluid is hygroscopic. It absorbs moisture from the air through the reservoir and hoses. The dry boiling point is the temperature at which fresh, sealed fluid boils. The wet boiling point is the temperature at which the same fluid boils after it has taken on about 3.7% water. Water lowers the boiling point, so old fluid can vapour-lock at a much lower temperature than new fluid. That is why brake fluid has a service life, not just a shelf life.

Those two numbers are the clearest difference between DOT grades. RBF 700’s 637°F dry and 401°F wet figures sit well above DOT 4 (446°F / 311°F minimum) and DOT 5.1 (500°F / 356°F minimum).

Service

Flush after every race weekend. Once the fluid has taken on enough water, that water can boil on its own and the lever travel grows. For a fluid this hot-rated, frequent changes are what keep the boiling-point advantage. On the street, a flush every six to twelve months is a sound interval. Shorter if the bike or car lives in a humid climate, or if the reservoir cap is often open.

RBF 700 is aggressive to paint, varnish, and skin. Wipe spills immediately and rinse skin with water.