The brake light is for the e brake. Does your truck have the "T" handle ebrake. I recall having to bump mine often to keep it from being lite.
The rear axle on my Hardbody (which essentially is a gen1) has a suspension lift proportioning brake valve (my own term). As you stomp on the brake the truck will drive and the rear end lift. As the rear end lifts the it will tend to skid if the same amount of brake force is applied. Thus this little gizmo reduces the amount of brake pressure to the rear wheels as the rear end lifts. If it is not functioning properly (like missing the spring) then then back end will tend to lock up and force the ABS to start pulsing. One thing to check.
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The rear axle on my Hardbody (which essentially is a gen1) has a suspension lift proportioning brake valve (my own term). As you stomp on the brake the truck will drive and the rear end lift. As the rear end lifts the it will tend to skid if the same amount of brake force is applied. Thus this little gizmo reduces the amount of brake pressure to the rear wheels as the rear end lifts. If it is not functioning properly (like missing the spring) then then back end will tend to lock up and force the ABS to start pulsing. One thing to check.
