Automotive Forums

I have a 1998 Mazda 4x4 truck, B4000 series.  Just last week I had my truck at a service station for a quick inspection and they said everything was fine.

Yesterday I was driving on a highway and I heard a noise that sounded like what a flat tire sounds like when driving on pavement.  I pulled over and the tires were fine.  I then continued home and the noise continued.  It became a banging noise and seems to be coming from the front of the truck.  There was also an occasional clicking noise and what sounded like fluid moving... I went for a little drive tonight around the block and the noise is still there, so it doesn't seem to matter what speed I am going at.  At high speeds it seemed to be a banging accompanied with a loud whirling noise.  At low speeds it is just the banging noise and the fluid sound...

Can anyone possibly give me an idea as to what this could be before I take it into the repair shop?

Thanks very much.