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Booster bleeding off vacuum?

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Old 11-21-2020, 09:31 AM
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Booster bleeding off vacuum?

Dialing in my carburetor, looking for potential vacuum leaks and testing individual components.

85 T/A, drum brakes.

When I apply vacuum directly to the brake booster it will pull to 18”Hg then stop, it will not go higher. It seems to be holding the applied vacuum.

Is this normal?

Thanks
Rob
Old 11-21-2020, 06:25 PM
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Booster bleeding off vacuum?

Originally Posted by theraymondguy
Dialing in my carburetor, looking for potential vacuum leaks and testing individual components.

85 T/A, drum brakes.

When I apply vacuum directly to the brake booster it will pull to 18”Hg then stop, it will not go higher. It seems to be holding the applied vacuum.

Is this normal?

Thanks
Rob
Yes, and the 90 degree barbed fitting going into the booster is actually a one-way check valve. If it's good, the booster should hold the vacuum.
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