1995 GMC C2500 Loss of Steering and Brake and ABS Light

The van turns on and runs fine but when I try to drive, the wheel will not turn easily I thought the problem was with the power steering fluid but it was at normal levels. Then when I pulled out straight I noticed the brakes were very hard to push, and the brake fluid level was fine also. The two problems I noitced at the same time and just the day before I changed the spark plugs and it drove fine, so I think/hope it is one solution but I am not sure of. And I noticed the brake and anti-lock brake lights were on in the dash, does this have something to do with the problem?