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A spongy brake pedal is typically caused by air in the brake fluid. A brake fluid leak which will lead to a very low level of brake fluid in your truck's master cylinder is the typical cause. If your electric trailer brakes are out of atjustment, it would only cause your rig to take longer to come to a stop. I would check the truck's brake fluid level, check for leaks. If all is well with that than it could even be the master cylinder leaking internally, internal fluid bypass.
Hope this helps!
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