As the 400 nears completion, I'm staying with the BTV for my braking needs. I'm convinced that the BTV worked once and that it will sufficently work again. I know there are many on both sides of this issue, and my best Packard-pal also disagrees with me.
I just had mine rebuilt by Midwest Powder Products of Leah, IL and they come highly recommended by other Packard guys. My unit had a broken spring and much associated pitting inside the cylinder, which was re-sleeved with stainless steel.
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