Rear off road leaf springs break when braking

When rear ride height is near maximum, for the rear offroad leaf springs, braking extends the springs, causing them to break. And the truck sags in the rear after the spring breaks.

 

you mean like this

 

More like This:
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You probably put to much torsion on it by incrase the height of the car‚ or something like this.

 

put it to 98 then it wont sag