I have a 2001 Scrambler 500 4x4. New right front caliper, rebuilt left front, and new pads on front and rear. I have been trying to bleed brakes. I'm using a vacuum bleeder and tried reverse bleeding, with a syringe. I have used over 3 large bottles of brake fluid. The hand brake lever is fairly firm and brakes will only slow the machine. I can't get enough pressure to lock up wheels. I can hold brake lever and still spin wheels by hand, with some resistance. I've not done anything with the foot pedal because it has never worked anyways. I can see no leaks in the system. What am I missing? Thanks for the help!