well for that, I would just leave on a spare set of calipers... of course I have several parts cars to swap parts from... if you do not, I can see where that would cause problems. personally, I would get a spare set of rebuilt ones. you should be able to get some reverse flare fittings that are the same thread at any autoparts store, and put a standard vacuum cap on the end...
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Don't use so much force that you "crush" the hose you are only trying to "pinch" the flow. That is why I used an old piece to to gauge the pressure. Other than that let it drain, you need to flush the system any way.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon

I had similar problem w/ 1990 190E, R/R Caliper. Solution was pressure bleeding the system to evacuate air pockets. One caveat, when M/C was pressurized to 10 psi, (pressure relief?) valves at rear of expansion tank bled profusely. perhaps 5 psi is enough to accomplish the job. Please note, this solution was only employed after needlessly replacing the master cylinder due to misdiagnosis. IF UNABLE TO DRAW FLUID FROM ANY CALIPER, TRY PRESSURE BLEEDING PRIOR TO REPLACING EXPENSIVE HYDRAULIC COMPONENTS.