You may wish to consider the following for planning your race weekend travel to Brno Circuit:

Parking is free if you wish to drive however, the car parks are around 2km from the circuit. There is a free shuttle bus service from the car parks but these can get crowded.

A free public bus number 400 runs from Mendlovo Namesti to the circuit frequently throughout the day.

There are good train connections running from Prague to Brno.
There is also a tram system which runs to Mendlovo and a ticket must be purchased and then validated when you board the train.

It is possible to get taxis from the stands outside the airports. There is also opportunity to rent a car at the airport.

The interactive map below shows the location of Brno Circuit. Use the controls to view the circuit as a traditional map or as satellite images, move around, and zoom in and out.