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Discussion Starter · #5 ·
Thanks all. I looked at hundreds of pics and never once seen one. I'm guessing it wasn't a very popular option?
 

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It looks like what is left of the Treddle Vac powered brake system. When I first saw it on a 57 it really looked out of place. Almost like it was off a 70's Caddy. Little did I know it could be ordered like that for 57.
 

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parts

55 and 56 had the tank t o but only had two stud mounts the 57 had three the 55 56 was mounted behind the wheel well not on top of like the 57 the dimples on the 57 differ from the 55 56 also the tred vac differs from years the air intake on top of the tred vac is not the same. the fire wall mount bracket also different .
 
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