If your system got air in it it could be making this noise. You may take it for a drive and recheck the fluid level or jack the front up then with the engine running turn the wheel left to right. For hydrolic on a taco I would recomend PSC or west texas offroad.(I think thay is what they are called)
![I Dunno... :dunno:](https://board.marlincrawler.com/Smileys/marlin/dunno.gif)