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By sounds of the hose failed on ur one which commons check ur booster for oil that hose has one way vavle and it fails then oil can pass into booster it common there was recall but the e53 not in it . I done the repair kit for my vac pump 2 o rings only cost 50 aud and done the save you full cost of new pump .#n6life lol with valve steams mine touch wood at 170,000 kms and still good but I change my oil changes to 6,000-7,000kms done care if clean or not pop cheap steam repair not lol. If need I find the recall info if you want it on booster failed and your brake paddle be hard as mine in the end sound like one them fart jokes that sit on seat before replacement . You need like Ista for bleeding the system after you replace the booster due to dsc /abs .
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