My problem started in another topic titled, "Brake Failure while Driving".
(Update - the small "slit" in the diaphragm inside the reservoir cap HAS to be there! I glued it closed thinking that might be the prolm until
I was bleeding the system - checked it for fluid and found the MC sucked the diaphragm right outta the filler cap and into the reservoir filler neck! so..it's gotta get air from somewhere right? or the fluid won't go down the lines.)
Wifey ran the system dry after a brake line ruptured. I replaced 2 lines into the Load Sensing Valve that come from the front of the truck into a brass "splitter " type fixture and another on the back axle to the RR wheel. The bleeder screw on the LSV is extremely corroded. I tried to get a wrench & vise grips on there before heating it but there's no room to work. (I've replaced a few lines on the front LH and RH sides and nvr bled this LSV before. I drove it for 1000's of miles - no prolm.)
I have..No leaks.. bled the system 4 - 5 times now ( up to 10 X each rear wheel) trying to a get a stiff brake pedal..no luk.
I took the master cylinder out, cleaned it, checked the rubber seals inside and bench tested/ bled it. It seemed good.
Removed the rubber tube from the brake booster and the whoosh of air told me it checks out good too.
Re-installed the original MC - bled the brakes again and reconnected the battery ground cable and started it. Pedal goes to the floor like there's no fluid in the system what so ever.
Got a new master cylinder - bench bled it - installed it - bled the system AGAIN and NO BRAKES.
AGAIN ..after starting it, the Pedal goes to the floor like there's no fluid in the system what so ever. WTF?
So far..the pedal never Ever got "hard" when bleeding..I just checked again now and it sinks slowly to the floor.
I'm lukn in the factory Service manual for answers but I suck at electrical.
WHAT IS WRONG HEEEEE? Come on! Really?
Anybody have this happen to them?
I think I SHUD get SOME kinda stiff pedal while pumping it up before bleeding YA?
I saw 7,800,000 other ppl looking asking the same type questions on line.
One guy even installed 3! different Master cylinders and 2! ABS modules with no luk. Nevr did see the final result.
Your help will much appreciated!
Thanx in advance.