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the leak between master cylinder and booster is where difference type of gasket is worn out depended on the type of your vehicle...older vehicle usually have flat gasket but mostly have O-ring Gasket the need to be replace. you have a bad master cylinder its leaking fluid into your booster the seal or oring is just to prevent vacuum leak change master cyl before the fluid attacks the booster and you spend another 170.00

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Q: Brake fluid leaking between master cylinder and booster?
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