First off, a disc/drum master cylinder from what car? If it's the older style A/F-body master, you won't push enough fluid through that rear port to get the rear calipers taken up, and a low pedal will result.
Secondly, the rear pads need to be within 1/32 to 1/16 of the disc rotor. If you are much farther than that, you won't get a good pedal for reasons as explained above.
For the front calipers - I'd suggest opening the bleeder, and compress the piston with a c-clamp until you get solid fluid.
Since you cannot do this with the rear calipers because of the adjusting mechanism - remove the master cylinder lid, open the bleeder on the caliper, and use a mity-vac to draw on the caliper until solid fluid comes out.
Now fill the master again, put on the lid and pump the brakes until the front calipers push out again. You should have plenty of pedal as long as that master cylinder is correct for the application and your problem was just air in the lines.
TIGER EFI - Electronic Fuel Injection for the Traditional Pontiac Engine.
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[This message was edited by PMDRACER on January 12, 2004 at 10:43 PM.]
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462 cid/ 6x-4/ TH400/ 3.36:1/ 28x10.5/ 3880#/ 12.35 @ 109.36/ 1.69 60 ft/ 4 wheel disc brakes/ 15 mpg