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I have a 99 F350 that tracks as straight as an arrow going down the road, but when the brake is applied it pulls to the right at any speed. I have had the frontend check with nothing being wrong, I have had a new brake job on the back, and had a rubber line replaced on the front. I did not notice the pulling before I took the truck in and had the brakes checked whick resulted in needing back brakes. I noticed then the truck was pulling to the right and took it back to the service tech. He said to drive it a couple of days and see if it gets better. It didn't get better, so I took it back and he saw wear on one of the front rubber lines so he replaced it with no improvement at all. I did notice a month or so before when I had the truck on jackstands that the front left caliper didn't seem to be releasing as well as the right side. I told the service tech this and he said both calipers were fine, but wasn't able to solve my problem. Does anyone have any suggestions for me. I was thinking of bleeding the brakes again myself to see if it gets any better, but any help would be greatly appreciated.
From your post I was not sure if you had replaced both from rubber brake lines or just one, but if you didn't replace both then I would go ahead and replace the other and rebleed the brakes. If that does not fix your problem it may be a caliper problem or something resticting brake fluid flow to one of the calipers. Check your brake lines for any visible damage and when bleeding the front brakes check for any difference in how the fluid is flowing out of the caliper. Good luck.
Does your steering wheel actually pull to the right? or can you hold it straight, hit the brakes and then the truck itself lurches to the right even though the steering wheel hasn't moved?