My bike is a 2004 CR250 2-stroke..prety sure it shares the same brakes as the CRFs did that year. Fluid is being pushed out of the rear master cylinder where the line attaches to it but when I put the line on, it doesnt want to push the fluid through the line. I have a vacuum pump here and spent quite a bit of time trying to get the fluid to come through and it wont, at all. Even held the brake lever down too. What am i doing wrong?? Has anyone else experienced this?