Krauhaus returns to the League Two club having come through the system at the Ravens and helped them secure promotion from the National League a year ago.
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Brentford B coach Sam Saunders told the club's website: “Ben came to us from Bromley and, in that time, they've gone on to become a Football League club, which is a fantastic achievement.
"They had a strong season last year, and now he returns to a team with real momentum.
"This loan is a great opportunity for Ben to showcase his quality on a consistent basis in men's football. We wish him and everyone at Bromley the very best as he continues his development."