Last night I installed a stoptech stage 2 kit on my 03 wrx, I'm having a bit of a problem. When I'm driving and use the brakes it's real soft and mushy, I have to pump the brakes a few times to get pressure to have the brakes work how they should, but after not pumping for a while, they go back to being mushy. I've bled the brakes and nothing but fluid comes out when I release the valve. When the car is off and you push in the brake pedal, a weird sucking noise comes from behind the right wheel well, the noise almost sounds like air in the lines moving around.

I don't think I'm leaking any fluid, as the level in the reservoir is still at the max point. One thing that I did notice was weird and I'm not sure if this is how it's supposed to work, but after going for a drive and using the brakes the level in the reservoir went down about halfway to the min level, but after letting the car sit overnight I noticed that it went back up to the max level.

What do you guys think the problem is?

Thanks for any help.

 

Problem solved: I re-bled the lines. I must have done something wrong before. I think I was having the valve open for too long when my helper was holding the pedal down. It feels good now, time to bed them in :-D...

 

Glad to hear you've solved the problem. Yes, any mushiness after opening up the hydraulic system is due to air in the lines or master cylinder. Some members use speed bleeders to aid in bleeding the lines.

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