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According to Federal Motor Vehicle Safety Standard (FMVSS) 135, the drum parking brake must hold a fully loaded vehicle stationary on a minimum slope of _______ up or down grade.

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According to Federal Motor Vehicle Safety Standard (FMVSS) 135, the drum parking brake must hold a fully loaded vehicle stationary on a minimum slope of 30% up or down grade.

User Farzher
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According to Federal Motor Vehicle Safety Standard (FMVSS) 135, the drum parking brake must hold a fully loaded vehicle stationary on a minimum slope of 30% up or down grade.
User Yully
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