The front brakes on my son's 2007 recon are not working. I adjusted pads till you get a little response but the lever still bottoms out. I noticed the pads were not wearing evenly. They end closest to adjustment is wearing out more than hydraulic side. I took apart. Cleaned and replaced shoes but I am still having same problem. I got them to work for a little while, after changing pads but now they are doing the same thing. I am thinking I may need to bleed the system. Not quite sure how to do this. Any help is appreciated.