Brake Fluid
Keep the master cylinder cover free of dirt and debris. The vent slits allow for diaphragm movement, and if they become plugged, movement of brake fluid below the diaphragm may be restricted, altering brake function.
View the brake fluid level through the sight glass on the top of the master cylinder. The eye will appear dark when the fluid level is full. If the sight glass is any color other than black, add brake fluid.
Maintain the brake fluid level between the MIN and MAX marks on the master cylinder reservoir.
Replace brake fluid at least every two years.