Welcome to the forum.
I would start with the simple things like making sure there is the correct amount of brake fluid in the reservoir and then move on to ensure that all the connections are solid at the ABS/HCU unit.
Remember to check the wheel speed sensors at the front (The harness connector is located in the engine compartment secured to the fender apron.) and rear (on the front side of the differential) of the truck.
Hope that helps.
I would start with the simple things like making sure there is the correct amount of brake fluid in the reservoir and then move on to ensure that all the connections are solid at the ABS/HCU unit.
Remember to check the wheel speed sensors at the front (The harness connector is located in the engine compartment secured to the fender apron.) and rear (on the front side of the differential) of the truck.
Hope that helps.