Whats the connection?

[navysnipe]

So I go out and start my 01 silverado 1500HD to warm it up, so I can take the kids sledding on this killer hill a town over. It starts OK and warms up but I put it in reverse and notice no power steering and no power brakes. What the heck, so I go out and check the power steering fluid and the belt...no problem. It is cold out about 3 degrees out but not too bad. So I rev the engine to about 3 grand and there is a pop and a squeal and everything starts to work. I dont get the connection between the two. Anyone else have this problem? I did replace all the brake lines about 3 months ago but I haven't had a single braking problem. It's a standard Vortec 6.0 L engine I have had a few problems with it but nothing that was as strange as this.

Navysnipe