Good morning all, been a while... replaced all my steel lines, hoses, brakes, drums, rotors, calipers , hardware etc. Did the rear first no issues worked great, then the front a few days ago with a new master cylinder (bench bleed) and now when I start the truck the pedal drops to floor with my foot on it but solid when truck is off. I did the two man bleed along with the one man hose in the bottle easily over a gallon total. and still nothing changed . Did the same with the old master cylinder to, tried bleeding with truck on and I can't get the pedal to pump up, no visible leaks anywhere. Any help would be appreciated! 2001 ram 1500 4x4 with rear abs. Thank you.

 

You either have a leak somewhere, or, there is still air in the system. Are the calipers installed properly? Bleeder valves facing UP? (sorry, have to ask, it's happened before. )

 

When I changed mine (before I went Hydroboost) I went through 5 master cylinders before I got one that worked. They were leaking internally.

 

Funny you say that about the calipers, my originals were down so I assumed that's the way ? A buddy just happened to mention the same thing about bleeders. It makes sense now... brakes are finally working !!!! Ugh such a brain malfunction that I missed the obvious. Thank you
I literally just finished.

 

LOLOL. You aren't the first, nor will you be the last, to do that. At least it works now.

 

I was in that boat before once, too. Bleeder screws must be facing up in order to bleed all of the air out of the system.

 

I did the same thing but had to use that caliper temporarily so i took off the caliper, bracket and rotor and put them together off of the truck and turned it so the bleeder was up and then bled it. Worked like a charm. I put it back on and it worked perfectly. LoL