[header] How to refill brake fluid [title] Park the vehicle on a level surface and turn off the engine. [substeps] Before proceeding, make sure that the vehicle is in park with the parking brake activated. Though the risk of a free-rolling vehicle is almost insignificant for this procedure, it's better to be safe than sorry. 
For manual transmission vehicles, put the car in first gear and apply the parking brake. [title] Locate the brake fluid reservoir under the hood.