Maybe look for a kink or a smashed spot on the steel lines.
I had a 78 f-150 4x4 that had a smashed line from a J hook and a careless tow truck driver. they towed it because I replaced the doors and didnt reinstall the door vin, but anyway when I got the truck out of the pound It pulled really hard to the right. it was the left front steel line that was the problem.
People who are willing to give up essential liberty to purchase temporary safety, deserve neither liberty or safety...
I would also check the wheel cyls. One of the pistons in the wheel cyl could be stuck. I had that problem on a 66 mustang. If you stepped too hard on the pedal no one on the planet could hold the wheel.
You can verify this if you have a helper you trust. Pull the wheel and the drum. Have the helper very gentely press on the brakes and verify that both shoes are moving about the same amount. It could be either side too. If one piston is stuck then all the fluid goes to the other and that shoe can move twice as much as the same one on the other side. It could also be in the back. You need a reliable helper because if they step too much on the brakes you have to put stuff back together and it creates an awfull mess with the brake fluid on the drive. Can't have one more thing about the truck for the wife to complain about. Now if I could just get her to use the front door instead of the garage life would be great
As cheep as rebuilt wheel cyls are from NAPA ( Mine cost under 10 per wheel for their better ones as in good, better, best) I would just replace all four and feel better. $40 is cheep when you can't stop and there is something that costs more than your house stopped in the road ahead of you.
77 F-100 Work In Progress - My Son wants it to be black with flames
