[Jimbro727]

Thanks for the replies!

I've spent the last few hours troubleshooting this with a buddy. Here's what we discovered:

• Using an SSBC brake pressure gauge, the front brakes read no pressure until the pedal is almost at the floor (maybe an inch from the floor), then in its final bit of travel, it starts to read some pressure.
• If we stabbed the pedal, we got more pressure - around 500PSI. If we slowly depressed the pedal, we got less pressure, sometimes around 250psi.
• We plugged the M/C ports and tried depressing the pedal, and it was as hard as a rock. We took that to mean that the booster and M/C are fine (no air, no internal leaking) - is that a correct assumption?
• The metering valve pin on the combination valve appeared to be sticking out more than we'd expect (it wasn't flush). We read that when pressure bleeding, it can cause the combo valve to cut off one of the circuits. We couldn't push the pin back in, it just popped right back out. I read somewhere to press it in as the brakes are bled, so we tried that, but as soon as we pressed the pedal, fluid shot out from the metering valve. We didn't do that again .
• We bled the front brakes. We kept getting bubbles from the front left, and got solid fluid from the front right. I feel as though there may be more air in the front left, because after letting it sit for a few minutes, we pulled more bubbles. As John said, maybe it's just air?

So what does that sound like to you guys? We feel confident we've isolated the problem to after the M/C. We think it could be an issue with the combination valve, or the rear brakes. We haven't bled the rear brakes yet - it got too late. Could air be the sole cause of these problems? The fact that the pressure gauge reads 0 until the pedal is almost floored makes us think it's not air, but we could definitely be wrong.