I have a 2000 f250 4x4 with 4 wheel abs. The front passenger side caliper keeps locking up while I'm driving and won't release and when I hit the brakes it pulls hard to the drivers side. I have put two calipers on the passengers side and put new brake lines on. Just trying to see if anyone can help.

 

Its common for them to stick.

http://www.guzzle7pt3.com/cu.php

 

If it pulls to the drivers side why are you focusing on the passenger side?

 

Sort of like cutting off a board twice and it's still too short!!!

I always replace calipers in pairs along with pads and rotor servicing.

 

Because the driver side only dose it when the passenger side is sticking.

 

I have replaced everything the calipers,lines,pads,rotors and hubs on both sides

 

Okay Stew - that puts a slightly different light on it then...

Have you checked out the front end of the truck for play in the balljoints and tie rods?

The caliper mounts - if they are slide mounts, you may have some corrosion/rust/wear on the slides which will cause a caliper to hang up and the brake pressure will then be applied un-evenly..

What did the old pads tell you? Are they worn evenly across the face?

 

I just put new ball joints on it every thing checks out on it. The problem is that it doesn't stick all the time I can drive it for a month or two with no problems then other times it dose it 2 or 3 or more a week

 

Floating calipers don't always stick and that may be part of the problem..
The real bad thing is that if the pads have already started a bad wear pattern, there is no economical way to reverse that - you just have to replace them.

Servicing the slides -
Have to remove the calipers, clean the slides thoroughly and use a fine file to remove any rough spots. I use silicone grease to lube the slides. Yes, the grease can attract and hold dirt, but I've not found that to be a problem in normal highway use.

Did you replace both flex hoses on the front?