My f150 feels like it is bouncing and pulling to the left when I am breaking from speeds 35+ it has an aftermarket lift that was put on before I bought it and my tires rub on a part of the lift when I turn shaprly. My biggest concern is the bouncing/jumping and pulling when breaking. Please help!

 

It could be an ABS system issue. When operating properly it's supposed to pulse the brakes in a hard (panic) stop to prevent skidding. To confirm this is the problem, unplug the ABS unit to see if it stops smoothly. Replacement is a costly repair so if it's an older truck you may want to consider getting one from the wrecking yard. Good luck

 

Where is the abs unit? The rear antilock light is on also.

 

The dash like definitely tells you you have an issue. Check fuses first before you replace the module.The ABS controller is located under the hood on the drivers side near the master brake cylinder. This is an example of what it should look like.
http://www.ebay.com/bhp/f150-abs-module

 

Am I just plain missing it? Can you see it?

 

What year is your truck? I see that it's a straight 6 but that shouldn't make a difference for the ABS. Also is this a USA or Canadian built truck? (vin number tells you) My 92 Explorer is Canadian built and many parts are different and everything is metric. All this will help I.D. your ABS modules location.