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Does anyone know if this can be done on the car? A faint squealing noise comes from the booster area through the last part of the pedal travel the first time I apply it hard after a while (doesn't have to be hard enough to trigger ABS) but doesn't do it on subsequent applications. I'm wondering if there's a leak in the diaphragm but don't know how to test this. All of the lines / one way valves/ connections etc are good.

Thanks for any help.

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https://www.sau.com.au/forums/topic/60334-can-a-brake-booster-be-tested/
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