Brake Issues

[Freebird]

I wanted to see if any of you pro's could help me out. I have a 95 7.3 and yesterday I was driving down the road and hit about 65 mph and it appeared that my brakes locked on just slightly. Terrible vibration I thought I had lost a front drive shaft. Pulled over and everything looked fine. My front rotors were hotter than heck. When I got back in the truck the ABS light is on and stays on. I could not drive it more than 15 mph down the road without it shaking the heck out of me. I have been needing to replace my vacuum pump for about a year now but I don't see how that can be the cause of it? Any suggestions where to start? Is it something in the ABS computer system causing this? Could it be the vacuum pump? I have not had a chance to pull the tire off yet and brake pads to see what it looks like. Any help would be greatly appreciated!!!!! Thanks!

[mschn99]

sounds strange. First of all the brake rotors on a normal functioning vehicle will burn you badly if you touch them, so the rotor itself being hot isnt abnormal...but the shake obviously is.......

Is your truck 4 wheel abs or just rear wheel abs....this will give us a place to at least start......also, im assuming the abs light came on when the shake happened and not before??

[Freebird]

I am not sure if it is ABS all the way around or not. It is a 4 wheel drive 3/4 ton disc front and drum back. I am wondering if a proprotioning valve went our or something like that? I have not had time to take the wheels off yet been out of town.

[jwiger]

the first thing i would try is just setting the from axle on jack stands and turning the tires. if you have one that hangs or grabs at spots then you can narrow down your search.