Question

if you experience brake failure while driving, you should: downshift and look for an area to slow down and stop pump brake pedal quickly, if useless, pump released parking brake stop off the road if possible, and call for help all of the above

Explanation:

When brake failure occurs while driving, all the listed actions are appropriate. Downshifting helps slow the vehicle, pumping the brake pedal (and using the parking brake if needed) is a standard response, and stopping off - road and calling for help is also necessary. So the correct option is the one that includes all these actions.

Answer:

All of the above