First, what was "serviced"? If someone attempted to hone pits out of a leaky master cylinder and went too far, the o-ring seals (which are really not for a Pantera) will be too small for the now-oversized bore, fluid will bypass the seals and zero pressure will result. There are two sizes of master cylinders, too. Using a 'kit' for one size on the other will not seal. If one of the two the tiny fill holes in the cylinder is blocked with 'stuff' (visible from the reservoir cap hole), the piston won't draw new fluid in on the upstroke and no pressure results. If the piston return spring is broken, the piston will stick at the bottom of the cylinder. There are really only a few other options: either one of the fittings or lines is now leaking, maybe under the car, so no pressure is developed, or you have somehow installed things such that there is an air pocket thats not bleeding out. The air pocket need not be very large, either. Finally, the slave cylinder may have coincidently failed, just to confuse things. Its Italian!
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