My girlfriend has a 1997 1500 4x4, I have replaced both front calipers, the rear drum brakes including the adjusters and drums, when driving it tracks nice and straight, when you hit the brakes it pulls HARD to the left, I have a nice brake bleeder that sucks all the air from the lines so Im pretty sure it isnt air in the lines. The peddle feels good and stiff. I followed the lines from the master cylinder, to the ABS pump, to the wheels, and see no proportioning valve or distribution block that would be an issue. Im stumped, hoping someone or a few people have some other ideas that could help me out. I appreciate any info, thanks

 

I have heard of the rubber brake lines going bad and collapsing and not allow brake fluid to flow freely. Never happened to me but it's possible. Worth a try.

 

most likely a front flex hose i've replaced a few on my 96 2500.get someone to step on brake and feel hoses with hand .

 

Yep, replace the flex lines, cheap enough......... and it only takes a small bulge on one to have it apply more pressure to the other side.