I have a wr450 that i ride on the street mostly and the front brake sucks. Like the preasure behind the leaver is weak and stopping power is weak but as i was riding it today all the sudden the the brakes felts great. The leaver had lots of preassure and there was good feel. the braking power still lacked a bit but i think it needs new brake p[ads any way. I have Bled the system multiple times with a vaccum to fix it but i have no clue why this would happen or why the preassure is so low in the first place. Some one have an idea why the preasure is so low and why it would feel good all the sudden and then go back to crappy?