What can be wrong with this 1993 ford tempo if you drive down the road and push your brakes you dont have any but if you pump them you do?

It could mean lots of things. Perhaps you have air in your brake system, or a leak in a hose. It may be your master cylinder is shot, or just low on brake fluid. Whichever, it means a thorough diagnosis and repair job is a must before they don't work at all.