hydro prob?

[vince72]

i have a problem that i hope someone can point me in the right direction;
i have noticed that after i drive the camaro for a long period of time i start to hear a very loud noice. the noice sounds something like either a belt squeal, or a bad set of brakes.
the noice is only heard after an hour of driving with normal driving conditions, the noice is only heard at very low speeds from about 10mph down. even with the noice the car stops and stears perfectly.
what do you guys recomend that i do or check?
thanks in advance
vince