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Classic Truck Discussion Forum

Re: loadstar w/ 345 stalling when brakes applied

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Kell

06-19-2017 09:56:05




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thinking it's probably a vacuum leak in the booster through one of the diaphragms or a seal. when i wait a moment before plugging the air inlet hose for the booster, and the block it, there's still strong vacuum. without a leak, i would think the air would fill the booster and there would be no vacuum on the inlet hose and air side of the booster. gonna pull it.




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Jon Hagen

09-14-2017 21:04:35




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 Re: loadstar w/ 345 stalling when brakes applied in reply to Kell, 06-19-2017 09:56:05  
When you step on the brake, that air hose from booster to air cleaner should flow air for a second then stop as the diaphragm hits it"s travel limit.

If that hose sucks air as long as you step on the brake, then a diaphragm has failed and booster needs to be rebuilt or replaced.



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