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Brake vacuum part

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Old Apr 4, 2022 | 05:30 AM
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nighthawking
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Brake vacuum part

Supposedly 1977 F750. Big vacuum hose off intake goes to this part on firewall near master cylinder. Other big hose goes to frame mounted booster. What is this part, and is it necessary? Thnx.
 
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Old Apr 4, 2022 | 06:26 AM
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That's a vacuum check valve. I'll get back to you later today with a decode.
 
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