Flushing the brake fluid

In the early 1990s, Honda pioneered the new LBS and DUAL systems. A number of motorcycle manufacturers have since launched similar technologies, all derived from linked brake systems. Now a benchmark in terms of braking quality and effectiveness, they're found on such models as the Honda VFR 800 and Gold Wing 1800.


ABS brakes are unique in that they sometimes require (depending on the make and model) the computer to be reprogrammed when a brake fluid flush is performed. Needless to say you have to be extremely careful and skilled when changing said fluid. The recommended brake fluid is usually DOT 5.1, because it's not silicon-based like the DOT 5. WARNING! These two types of fluid are not compatible and should never be mixed.

Before you begin, you need to follow the correct procedure. First, you have to keep the manufacturer's repair manual at hand. In it you'll find all the technical info, repair steps and recommendations. Also required are clean trays, ethylic alcohol (industrial alcohol sold in hardware shops through their paint department), proper tools and oilproof gloves. Brake fluid is a contaminant; therefore, it can create significant damage and potentially lead to skin cancer. Likewise, safety glasses are necessary to avoid eye damage. Use the appropriate DOT fluid as well as non-foamy, non-cottony towels that won't deteriorate and cause a failure in your brake system.

There are different ways to perform a brake fluid flush, depending on whether you need to replace the calliper seals or simply flush the system. In the first case, it's better to retrieve the entire brake assembly without dismantling the components. Simply unbolt the fork arms or swingarm, the master cylinder with the handle or the brake pedal, depending on where you're working (the front or rear brake). Then, lay everything on your work table -- flushing the brake fluid will be much easier.

This procedure allows you to place the tubes or hoses at a height that will make it possible to completely take the air out and flush the used fluid. You'll need a vise or clamp to maintain the master cylinder firmly in place in order to fill it with a brand new fluid.