Hank, Did your car have this leak before you had DMC Joe service the brakes? If there was a leak at the calipers, he would have seen it. I suggest taking all the wheels off and inspecting again for any sings of leakage. There is a chance that your leak could be elsewhere in the system such as in one of the flexible hoses running to each caliper or at one of the "T" junctions in the front or the rear UNDER the car. When my master cylinder sprung a leak, it leaked at the junction between the master cylinder & the power assist. The fluid leaked straight down, so it wasn't obvious by looking on the top side. When I saw the puddle on the floor, it looked like a coolant leak. When I pressure tested the coolant system, I DID have a leak in that area. I tightened the leaky hose only to wonder where else the leak was coming from. It was the master cylinder, not the coolant system. If your brake system has only a small leak, maybe there are enough surfaces around the frame & fuel tank to soak it up before it could drip on the floor. If your master & calipers are very old, you might ought to go on and rebuild them. PJ Grady sells a float that isn't an exact replacement but can be made to fit by changing the connectors. With it, I have some peace of mind knowing that I might have some warning before the brakes are compromised. Walt Tampa, FL