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1991 C4 differential lock slave cylinder check

Brakes

Vehicle Information: Model: 964; Year: 1991; Body Type: Coupe; Total Mileage: 83000;

My local Porsche mechanic is not certain that the differential lock slave cylinders need to be replaced but is willing to do this at $1000 in parts and $1500 in labor. To be certain that my intermittent brake failure (described in 8/06) is due to hydraulic brake fluid being pumped into the trasmission oil as you suggested, how can I check the transmission oil to see if it is being contaminated with brake fluid? If the dealer uses a Bosch Hammer to check the brake system, will that confirm that the differential lock slave cylinders are bad or which one is bad? Thanks.

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