The brake pedal on my Marauder is really spongy. There is a lot of travel before the brakes begin to grab. And it seems like if I keep pushing, the pedal keeps moving towards the floor. I have the TCW SS brake lines, so I know it's not rubber hoses expanding. The brake fluid lever is fine. I also flush through new brake fluid each spring.

Is this a bad master cylinder or vacuum booster?

Thanks,
Curt