I have a '69 RSSS with a disc/drum brake set up. I just bought the car about 2 months ago and when I applied the brakes the front right caliper would grab and not release, so I ended up replacing the front calipers, brake hoses, and master cylinder (found out that one rubber brake hose had collapsed). I am trying to bleed the front brakes and can't seem to get rid of the air or build up any pressure on the pedal. All the fittings are tight with no leaks anywhere. I took the car for a road test and the brakes are really weak and I have to push the pedal to the floor to get any response from the brakes, then the brake warning light comes on. It just seems that I can't get the air out of the front brakes. The back brakes bled out okay. I also bench bled the master cylinder before it was installed. Would the metering valve or proportioning valve have anything to do with this? Any suggestions?

Thanks

sometimes, you gotta run about a gallon of fluid thru before you get all the air out.
it is one of those things that doesn't work, and right when you are about ready to smash the car with a big hammer and set it on fire, all of a sudden the brakes are rock solid.
try tapping the calipers with a hammer to dislodge any bubbles, and find someone who can pressure bleed the brakes.

Having just replaced my master and prop valve and bled the brakes you might want to check the prop valve for leakage. You can't believe the crude that builds up inside them. Make sure the caliper bleeder screws are facing upward and hold in the button on the back of the prop valve while bleeding. I used a pressure bleeder and found that when you think that you have bled the brakes enough, bleed them some more.

If your bleeder screws are up you might try these two other options

1) Install Russel Speed Bleeders, available almost anywhere these days, well worth the $10-$15

2) Pull the MC and bench bleed it again. While its out, wipe it with lacquer thinner and apply a few coats of AccuClear or DiamondShield clear to protect its natural finish or else it will look old and rusty in a few months time if you don't.