OK Heres the deal i have a 2005 STX and I have blead my brakes about 3 times and had a shop do it to. But what happens is they will be fine but every now and agian you press them and i have to go to the floor to even start slowing down then after awhile they will be fine. I have read some of the other post on brake issues like bad master cylinder and bad o Rings but they had constent loss of brake pressure the fact that it comes and goes is what is weird. Well I Hope Someone has some Ideas.

 

The best bet is a faulty master cylinder. A seal may be on the edge of failure sometimes sealing, sometimes losing the seal. Failure of either front or rear piston seals will get the brake-differential-pressure safety valve into the act causing all kinds of strange things. Have it checked out by someone who knows the system.

 

Hey thanks for the help.