Tweaked

I've got brand new caliper on right now (both fronts) I traced the lines from the master cylinder to all 4 corners and they are all dry from what I can see so I'm fairly certain it's not a cracked line. I suppose I could go ahead and re-bleed the master again for the hell of it and see what happens.

Putting a measurment on the amount of brake fluid is hard but I've gone through probably about 4 or 5 master cylinders reseviors worth (but don't worry I never let it run below the min mark on the resevior) You say ABS 'bleeders' is there more than one becuase all I could see was one bleeder valve that stuck out towards the middle of the vehicle. I really don't see any more air comming out though, I've bled plenty of brakes before. I've got 3 other vehicles (Probe GT, Mazda MX6, and an F-150) and have never had this kind of issue before with brake work. Very frustrating.

My god, I'm not going to argue semantics with you. Yes I bench bled the master cylinder before it was installed, it seems like air in the lines to me but I'll be damned if I can find where. That and the flippin ABS light is on and has been since after I started this process.

Yeah I bled the entire system (in the following order) The ABS valve on the passenger side framerail Rear pass side Rear drivers side Front pass side Front drivers side and then bled the ABS valve again. ( I bled it first because I had bled the system a couple times before this without realizing the ABS valve was there, so I did it once first and once afterwards) I did bleed it untill I saw no air comming out and I used one of those bleeder systems with a tube going into a bottle. No air bubbles. I haven't checked the rear but they are not drums they are discs The peddle will stiffen up a bit when you pump it with the engine off but if you wait a couple seconds it looses the pressure and you can push the pedal to the floor again. The thing that is frustrating is that none of this was happening untill I changed the front calipers, there was plenty of pedal pressure but the calipers were dragging. As soon as I replaced them there has been no pressure since.

The irony here is that your trying to make me look stupid with your comment but had you read the 1st paragraph of the 1st post you would have saved you, yourself looking foolish. But thanks for the smartass comment.

Alright so I replaced the Booster and still have the same damned problem. I think this truck is going to the scrap yard unless someone can tell me what the hell the problem is.

Well I disconnected the battery but i didn't pull anything off of the ABS unit.

Alright, I think this may be my first post so hello. I've got a 92 Pathfinder with 4 wheel disc brakes and rear ABS I have seen in my searches something about LSV but I don't beleive I have that option as I can't see it anywhere on the passenger side frame rail all I see is the ABS valve. When I first got the truck (free from in-laws) the brakes were dragging so I put on a set of old calipers a freind gave me...we weren't sure if they still worked but it was worth a shot. After putting them on I bled the front brakes and had pretty much no damn pedal. So we bled the entire system, still nothing. So I put the old calipers on just to make sure I could get pressure again...nothing. So I replaced the master cylinder....bled it and the entire system...still no brake pressure so last week I went out and bought two brand new calipers, bled the system and still no damned pressure. I'm thinking its somehow the booster as when the truck is off when I pump the pedal it builds a little pressure but if I leave it for 30 secs it looses all of it and when I start the truck the idle goes wonky if I keep pumping the brakes and it will build very little pressure and then if I'm off the pedal for even a couple seconds it will go right to the floor. Also I sprayed some water right where the master and the booster meet up and if I have someone pumping the brakes I can see it bubbling like air is being pushed out. So am I right do I have a bad brake booster? ...oh and I did inspect the check valve going to the booster it is only allowing air one way.