The spring is there to bring the brake pedal up fully to the rest position. The brake rod is adjusted to give 1/4 inch or so of play at the pedal so any residual pressure in the brake system can bleed off. Secondly I believe your unit has a cable which actuates the inching spool- make sure you have full engagement of trans & no by-pass what-so- ever when the pedal is in the up/rest position.
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