Can we draw the following hypothesis from the context? 

Context:

How to refill brake fluid<br>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.

Hypothesis: you should always be sure the car is park