Is there a way to test a master cylinder without unbolting it? the brakes are extremely mushy but it might be the drums. any ideas?

-Jeff

Try to bleed all the air out of the lines if you already haven't done so.

with the car off....pump the brake pedal a few time to full pressure.If the pedal starts to slowly..or quickly lol..creep down you prolly have a bad M/C

If you've ever run the master cylinder dry, you would've uncovered the bleed holes in the bottom of the reservoirs. In which case, you simply need to rebleed the system (including MS). This can be done on the vehicle. Simply go get a MS bleeder kit from your local parts house.

Even if you've never run it dry, rebleed the system anyway. It's the simplest thing to try first.

Also, inspect your vacuum line to the booster diaphragm as well as that little PCV filter that's on the booster.

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