87 yj brakes intermittently dragging/seizing
I have an 87 yj. I had issues with not being able to drive much over 40mph. I took the front brakes apart and my rotors were warped and pads cracked to hell. I replaced the calipers, and pads, and rotors.
It was still dragging. I went to replace the hoses, and couldn't get them off the lines. So I replaced the brake lines and hoses to both sides. I flushed the fluid but the problem still happens, sometimes when I hit the brakes too many times, it will go from normal to rock hard. Other times right away. But here is the weird part...they were dragging wicked bad today, and when I pulled over I went over the rumble strips the brake pedal went from rock hard to normal, and they stopped dragging. I relubed the caliper pins, and drove it around. It was fine for a little and then same story, dragging again. I went and hit a few potholes and still dragging. Back to rumble strips and they released.
The proportioning valve was replaced 2 years ago along with the rear wheel cylinders, lines, and shoes. I have no freakin clue what my problem is. Any suggestions?