Reservoir Sock?

[Trip]

From an old road racer:

I started using them in the early 80's to stop brake fluid from blowing up onto the inside of the windscreen at high speeds on the race track. The cap is vented to allow the fluid to go down as the brake pads wear and that allows the fluid to wick up when the wind creates a vacuum behind the windscreen. At tracks like Road America, Daytona, Brainerd, Texas World Speedway, and Road Atlanta we would wear a new set of hard pads down to the base plate. At Road America we had to change the pads mid race because they were gone. To allow for excessive pad wear it was imperative that the resevoir be filled to the top and that exacerbated the brake fluid blowing onto the windscreen. During a shopping trip to the local Walmart in Fon du Lac Wisconsin I passed by the sweat bands hanging and decided to try them in an effort to stop buying a new screen after every race. It works. They have since been on every race bike I have ever had. I don't use them on my street bikes.