Yes. Do as recommended and bleed the brakes, full bleed and flush. As mentioned, the bleed kit you can get on Amazon. It will pay for itself because brake systems on everything should be bled periodically, and on MTB's you should probably do it once a year whether you think you need it or not, because the fluid absorbs water, and that will cause you problems, sooner or later. When you go through the bleed process, you will notice the old fluid that you push into one of the bleed syringes is darker. That's because it's contaminated. Sometimes it's less about how much fluid is in the brakes, and more about how much water and other contaminates is in the fluid that's in your brakes.
