ok was doing 2 new calipers on the front of 2 dr 96 318 4x4 dodge ram have done this before on a ram none theless but heres the problem put the new calipers on checked for leaks had none started bleeding the brakes all the way around and i can get good strong pressure in the lines but the pedal will not hit a stoping point till it bottoms out and then as soon as you turn the truck on ALL pressure immediatly disappears an of course the abs light kicks on you can build a lill pressure by pumping the brakes with the engine on but let the pedal sit still for a min an all pressure disappears but i didnt mention that the light will kick off when you pump brakes and get some pressure in it soo any help will be appreciated im thinking master cylinder but i figuered id come ask you guys see what yall thought

 

sounds like your master cylinder is toast.
even if it was ok before the caliper swap you may have ( through the bleeding process ) pushed the aged seals and whatnot past their normal travel and scored something causing this condition. I would throw a reman master cylinder at it.

 

ok so sounds good now ive heard when you do a master cylinder your supposed to "bench bleed" it how the heck does that work? and just what do i need to keep an eye out for when replacing one

 

maybe a write up on replacing one for this type of truck?

 

Hope your not trying to bleed these by yourself. It is impossible.

 

Not true. I've changed my MC and bled my brakes many time BY MY SELF with great results. It can be done.

 

2 people bleeding the brakes is easier unless you have the right tools. the order in which you bleed your brake is also important. RR RL FR FL is the order. i don't know if you have drums in the back but if you do you should make sure they are adjusted or it could cause the pedal to be soft.

 

I definitely agree that 2 is better then 1 but my point was that he can do it himself. I didn't want him to feel discouraged. That's all.

 

When you bench bleed your master you put it in a vice, then fill it with fluid and use a rod or screw driver to push the cylinder in and get fluid to come out the were the lines should be. then put the caps back on and install it.
It just saves some time in getting all the air out of the lines.

 

alright skab thank you and yes i do have 2 people just to put your worrys to rest folks hahah