brake issues

[Bronco Kid!]

ok hey guys i am having some issues here.. i bronco has been sitting since 2007 when i blew the motor up, i just recently replaced the motor and converted it from efi to carb. i went to move my bronco for the first time to find that the brake pedal was pretty much frozen in place, and my front brakes are locked up.. i tryed bleeding the brakes and i can now move the peddal but the brakes are not releasing and the pedal goes down very easy then hits a hard spot.. i also cracked the lines at the master cylinder while my wife was holding the pedal to the floor and the pedal did not drop and no fluid came out of the master (the resivoir is full).. and also i dont have the big hose coming out of the booster attached to anything i tryed attaching it to the big vacume port on my carb but when i would push the peddal in it would come back up very slowly.. help please!!

 

[Rons beast]

Sounds like alot of things age bound up from sitting so long.

First the vacuum hose to the brake booster has to be attached to a constant manifold vacuum source. Without it even the best brake system will be rock hard at the pedal after a few pushes on the pedal.

Then **** the brake pedal pivot point.

The pistons are probably frozen in the calipers. Unless you are experianced in rebuilding them get new ones. The rear wheel cylinders have been sitting too, and they are relativly cheep. Change them, and any other hardware that is rusty or damaged. If it was my rig I would change the rubber flex lines too, and flush the whole system with new fluid. The master cylender may be a problem after you start to bleed the system and push the cups into the dirty parts of the bore....I would change it too. Just been sitig too long, and how old is it anyway. Better safe than sorry. Of course with all that you may want to replace shoes and pads and turn rotors and drums.

Sounds like alot but brakes are nowhere to cut corners.

Let Us know your progress, and Good Luck.

 

[Bronco Kid!]

ok so i have to find vacume on my manifold and not my carb correct?

 

[Bronco Kid!]

well i installed new calipers and the peddal goes all the way to the floor and will build no pressure by pumping peddal, also the fluid level is not changing in the master

 

[Rons beast]

Yes the booster must have manifold vacuum. If there is a large port at the base of the carb, below the throttle plates, that will be giving manifold vacuum, but straight from the mainfold is better.

Did you replace the rear wheel cylinders? You may be leaking fluid from there.

When replacing WC, or lines or calipers the best way is to gravity bleed. Open the bleeders and take the top off the masted, fill with clean fresh fluid, (must be from a new or very recently opened can. brake fluid pulls moisture from the air.)

Allow fluid to run out of all the bleeders from gravity alone. Then close all bleeders and gently pump the pedal and bleed from the point farthest away from the master, (right rear), and work your way closest to the master. That will be the most effecient way to rid the system of air. Otherwise you may just be moving an air pocket back and forth.

Good luck. Keep us up to date.

 

[Bronco Kid!]

Yes the booster must have manifold vacuum. If there is a large port at the base of the carb, below the throttle plates, that will be giving manifold vacuum, but straight from the mainfold is better.

Did you replace the rear wheel cylinders? You may be leaking fluid from there.

When replacing WC, or lines or calipers the best way is to gravity bleed. Open the bleeders and take the top off the masted, fill with clean fresh fluid, (must be from a new or very recently opened can. brake fluid pulls moisture from the air.)

Allow fluid to run out of all the bleeders from gravity alone. Then close all bleeders and gently pump the pedal and bleed from the point farthest away from the master, (right rear), and work your way closest to the master. That will be the most effecient way to rid the system of air. Otherwise you may just be moving an air pocket back and forth.

Good luck. Keep us up to date.

dude thanks for the input, i got so irritated today i had to take a couple hour break, but came back to it and put a new MC in and that was the issue the piston was frozen in my old one, also i am going to replace the wheel cylinders because i remember a leak in my rear right one before the engine blew.. but even though i havent bleed them yet it is so relieving to beable to pump the peddal and get pressure.. thanks man and i will keep you posted