Always use brake fluid which has the correct specification. See LUBRICANTS AND FLUIDS.
Brake fluid damages painted surfaces. Soak up any spillage with an absorbent cloth immediately. Wash the area with a mixture of car shampoo and water.
Only use new fluid from an airtight container. Fluid from open containers, or fluid previously bled from the system, will have absorbed moisture. Contaminated fluid will adversely affect performance, and must not be used.
Do not top up the brake fluid to the maximum mark unless the brake pads have been replaced. If unsure, seek qualified assistance.
To top up the brake fluid: